Sometimes, the cleanup process happend AFTER vhosts are installed, which
resulted in no vhost declared.

Parsing declared vhosts in pillar and comparing to present files on the
server allows to remove only unwanted files.
Plus, files are kept in sites-available, and removed only in
sites-enabled.

* 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.

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