Also, check config before applying

* servers_config should run without service dependency. Service is
  managed in servers.sls.
* dropped nginx_service_reload in favor of extending nginx_service
* wait for all file states (create and delete)
* create dirs for symlinked files

* Automated using https://github.com/myii/ssf-formula/pull/302

* correctly set dependencies in configuration
* update RPM repo key
* add tests for passenger installation as nginx module
* update test matrix

* Automated using https://github.com/myii/ssf-formula/pull/237

* Checked using https://github.com/myii/ssf-formula/pull/131

* Close #261
* https://nginx.org/en/docs/ngx_core_module.html#worker_connections

* Close #241

```bash
Examining nginx/pkg.sls of type state
[201] Trailing whitespace
nginx/pkg.sls:149
    - gpgcheck: 0
```

```bash
Examining nginx/map.jinja of type state
[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:175
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:181
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:188
})%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:192
    })%}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/map.jinja:195
    })%}
```

```bash
Examining nginx/certificates.sls of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
nginx/certificates.sls:40
    - contents_pillar: {{salt['pillar.get']('nginx:certificates:{}:public_cert_pillar'.format(domain))}}

[202] Jinja statement should have spaces before and after: {% statement %}
nginx/certificates.sls:47
{% if salt['pillar.get']("nginx:certificates:{}:private_key".format(domain)) or salt['pillar.get']("nginx:certificates:{}:private_key_pillar".format(domain))%}

[206] Jinja variables should have spaces before and after: {{ var_name }}
nginx/certificates.sls:54
    - contents_pillar: {{salt['pillar.get']('nginx:certificates:{}:private_key_pillar'.format(domain))}}
```

* Automated using `ssf-formula` (v0.6.0)

* Automated using `ssf-formula` (v0.1.0-rc.2)

- currently you're forced to define extra states if you opt to install nginx with passenger,
 if you want the same outcome for passenger and nginx installs with equivalent config
- passenger is an extra module on top of nginx, makes no sense to end up with less configuration by default

(...) 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

* Route all to `nginx/deprecated.sls`

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.

With this one can now also write

 - include:
   - file1
   - file2

Rather than only

 - include: file1
 - include: file2

on openSUSE Leap 15.0, the string was systemd.cpython-36

like openSUSE and SLES

to reduce duplication of constants

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

default value if dhparam isn't defined in the pillar.