* fix(opensuse): update to openSUSE Leap >= 15.4

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

* feat(opensuse): optional openSUSE devel repository

All modern openSUSE releases (Leap 15.x, Tumbleweed) ship nginx in the
default repositories. The devel repository should not be used unless the
user knows what they are doing.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

* fix(opensuse): pkgrepo.absent TypeError

Repository can only be removed by name, other fields cause del_repo() to
fail.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

---------

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

Also, check config before applying

* Replace the Jinja brackets to avoid evaluating when `pillar.example` is
  used from Kitchen
* References:
  - https://github.com/saltstack-formulas/libvirt-formula/pull/60#issuecomment-537965254
  - https://github.com/saltstack-formulas/libvirt-formula/pull/60#issuecomment-537988138

* Semi-automated using https://github.com/myii/ssf-formula/pull/27
* Fix errors shown below:

```bash
nginx-formula$ yamllint -s .
./pillar.example
  146:56    error    empty value in block mapping  (empty-values)
  147:76    error    empty value in block mapping  (empty-values)
  148:59    error    empty value in block mapping  (empty-values)
  150:22    error    empty value in block mapping  (empty-values)
  151:39    error    empty value in block mapping  (empty-values)
  152:39    error    empty value in block mapping  (empty-values)
  153:39    error    empty value in block mapping  (empty-values)
```

* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:

```bash
nginx-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
pillar.example
  5:1       warning  missing document start "---"  (document-start)
  6:89      error    line too long (110 > 88 characters)  (line-length)
  7:89      error    line too long (99 > 88 characters)  (line-length)
  19:89     error    line too long (132 > 88 characters)  (line-length)
  35:25     warning  truthy value should be one of [false, true]  (truthy)
  36:89     error    line too long (106 > 88 characters)  (line-length)
  40:89     error    line too long (115 > 88 characters)  (line-length)
  43:16     warning  truthy value should be one of [false, true]  (truthy)
  44:89     error    line too long (105 > 88 characters)  (line-length)
  48:16     warning  truthy value should be one of [false, true]  (truthy)
  54:14     warning  too few spaces before comment  (comments)
  57:13     warning  truthy value should be one of [false, true]  (truthy)
  57:18     warning  too few spaces before comment  (comments)
  58:14     warning  too few spaces before comment  (comments)
  60:5      warning  missing starting space in comment  (comments)
  60:89     error    line too long (96 > 88 characters)  (line-length)
  61:89     error    line too long (90 > 88 characters)  (line-length)
  62:89     error    line too long (90 > 88 characters)  (line-length)
  63:89     error    line too long (94 > 88 characters)  (line-length)
  64:5      warning  missing starting space in comment  (comments)
  64:89     error    line too long (96 > 88 characters)  (line-length)
  68:9      error    wrong indentation: expected 10 but found 8  (indentation)
  76:9      error    wrong indentation: expected 10 but found 8  (indentation)
  86:9      error    wrong indentation: expected 10 but found 8  (indentation)
  90:14     warning  too few spaces before comment  (comments)
  90:89     error    line too long (104 > 88 characters)  (line-length)
  92:6      warning  missing starting space in comment  (comments)
  92:89     error    line too long (106 > 88 characters)  (line-length)
  94:89     error    line too long (104 > 88 characters)  (line-length)
  97:6      warning  missing starting space in comment  (comments)
  97:89     error    line too long (106 > 88 characters)  (line-length)
  100:62    warning  too few spaces before comment  (comments)
  100:89    error    line too long (121 > 88 characters)  (line-length)
  101:62    warning  comment not indented like content  (comments-indentation)
  101:89    error    line too long (116 > 88 characters)  (line-length)
  102:89    error    line too long (112 > 88 characters)  (line-length)
  103:89    error    line too long (99 > 88 characters)  (line-length)
  105:89    error    line too long (124 > 88 characters)  (line-length)
  106:8     warning  missing starting space in comment  (comments)
  106:89    error    line too long (117 > 88 characters)  (line-length)
  112:89    error    line too long (97 > 88 characters)  (line-length)
  120:31    warning  missing starting space in comment  (comments)
  123:89    error    line too long (95 > 88 characters)  (line-length)
  127:13    error    wrong indentation: expected 14 but found 12  (indentation)
  151:33    warning  too few spaces before comment  (comments)
  151:89    error    line too long (94 > 88 characters)  (line-length)
  152:22    warning  too few spaces before comment  (comments)
  152:89    error    line too long (90 > 88 characters)  (line-length)
  153:21    warning  too few spaces before comment  (comments)
  153:89    error    line too long (101 > 88 characters)  (line-length)
  154:22    warning  too few spaces before comment  (comments)
  155:18    warning  too few spaces before comment  (comments)
  155:89    error    line too long (103 > 88 characters)  (line-length)
  163:89    error    line too long (100 > 88 characters)  (line-length)
  164:89    error    line too long (106 > 88 characters)  (line-length)
  165:18    warning  truthy value should be one of [false, true]  (truthy)
  167:89    error    line too long (109 > 88 characters)  (line-length)
  170:10    warning  missing starting space in comment  (comments)
  172:10    warning  missing starting space in comment  (comments)
  172:89    error    line too long (120 > 88 characters)  (line-length)
  173:10    warning  missing starting space in comment  (comments)
  173:89    error    line too long (118 > 88 characters)  (line-length)
  174:89    error    line too long (120 > 88 characters)  (line-length)
  175:20    warning  truthy value should be one of [false, true]  (truthy)
  175:89    error    line too long (102 > 88 characters)  (line-length)
  177:89    error    line too long (100 > 88 characters)  (line-length)
  178:89    error    line too long (101 > 88 characters)  (line-length)
  182:13    error    wrong indentation: expected 14 but found 12  (indentation)
  184:15    error    wrong indentation: expected 16 but found 14  (indentation)
  186:15    error    wrong indentation: expected 16 but found 14  (indentation)
  189:15    error    wrong indentation: expected 16 but found 14  (indentation)
  193:9     warning  comment not indented like content  (comments-indentation)
  196:13    error    wrong indentation: expected 14 but found 12  (indentation)
  198:15    error    wrong indentation: expected 16 but found 14  (indentation)
  202:15    error    wrong indentation: expected 16 but found 14  (indentation)
  206:9     warning  comment not indented like content  (comments-indentation)
  218:16    warning  too few spaces before comment  (comments)
  218:89    error    line too long (96 > 88 characters)  (line-length)
  219:18    warning  truthy value should be one of [false, true]  (truthy)
  223:57    warning  too few spaces before comment  (comments)
  223:89    error    line too long (111 > 88 characters)  (line-length)
  224:57    warning  comment not indented like content  (comments-indentation)
  224:89    error    line too long (118 > 88 characters)  (line-length)
  226:89    error    line too long (90 > 88 characters)  (line-length)
  236:18    warning  truthy value should be one of [false, true]  (truthy)
  245:89    error    line too long (108 > 88 characters)  (line-length)
  252:89    error    line too long (104 > 88 characters)  (line-length)
  305:89    error    line too long (115 > 88 characters)  (line-length)
  306:32    error    trailing spaces  (trailing-spaces)

test/salt/default/pillar/nginx.sls
  1:1       error    too many blank lines (1 > 0)  (empty-lines)
  7:1       warning  missing document start "---"  (document-start)
  11:9      error    wrong indentation: expected 10 but found 8  (indentation)
  23:18     warning  truthy value should be one of [false, true]  (truthy)
  24:18     warning  truthy value should be one of [false, true]  (truthy)
  28:18     warning  truthy value should be one of [false, true]  (truthy)
  31:13     error    wrong indentation: expected 14 but found 12  (indentation)
  33:15     error    wrong indentation: expected 16 but found 14  (indentation)
  36:15     error    wrong indentation: expected 16 but found 14  (indentation)
  38:1      error    too many blank lines (1 > 0)  (empty-lines)
```

(...) for snippets filename.
BREAKING CHANGE: Users have to modify their pillar
according to this commit. Users MUST append '.conf' for their
existing managed snippets.

First implementation of TOFS for:
nginx_config, passenger_config, servers_config and snippets
Introduced tplroot on modified files as well
Fixed GH link of nginx.conf file in docs/TOFS_pattern.rst
Fixed test for snippets name pillar

BREAKING CHANGE: all previous `nginx` based configurations must be reviewed;
`nginx.ng` usage must be promoted to `nginx` and any uses of the original
`nginx` will have to be converted.

Squashed from:

* pillar.example: an include was missing a colon
* pillar.example: 2 directives not indented properly
* pillar.example: added the stock log_format
* pillar.example: make log path match map.jinja
* pillar.example: worker_connections value from latest mainline nginx
* pillar.example: fixed other uses of include
* pillar.example: corrected formatting
* pillar.example: corrected log_format
* pillar.example: reset log_format to try another day

With this one can now also write

 - include:
   - file1
   - file2

Rather than only

 - include: file1
 - include: file2

... by providing a pillar string. I developed this for use in
combination with ext_pillar and file_tree to deploy letsencrypt
certificates.

tabs cause salt to trigger a render error because tabs are 'illegal':
```
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 33, column 32:
            pid: /var/run/nginx.pid\t\t### Directory location must exist
                                   ^
```

Improvement - Disable reload of nginx when enabled=False (previously the nginx was always reloaded if settings.config != None; even with enabled=False)

Build NGINX from source with nginx.ng state with support for passing
compile time flags necessary for installing modules such as more headers
by the openresty project.

* removed override releasever variable use for CentOS