Add server_status state to create a default server_status handler for localhost

Document Stapling options in pillar.example

The formula currently adds a Listen directive for the port '*' if
any configured vhost is configured to listen on :* which does not
work and instead prevents apache from starting.

It is possible to prevent this by setting the
exclude_listen_directive pillar to True but this is a manual
workaround.

Instead, this commit excludes :* Listeners automatically.

The docroot fix from PR#240 worked fine for default servers.
But as soon as one uses vhosts this broke as the vhosts were
created under the docroot in /var/www/html rather than the better
/var/www.

Fix this by differentiating between docroot and wwwdir.
Further allow to override both in Red Hat-style configs.
The override allows to reuse this formula for the softwarecollections
rpms.

* [ssl] [debian] manage ssl.conf with pillars
* [apache] make cyphersuite a list
* [apache/ssl] switch back to strings, lists merge is not good

Including optional per-OS templates

(Solves https://github.com/saltstack-formulas/apache-formula/issues/153)

sysconfig.d/global.conf is re-written by sysconfig on openSUSE

If MaxRequestWorkers is greater than 256 than you also need to set the
ServerLimit value which is defaulted to 256 but has a 20000 hard maximum

* Adding exclude_listen_directive option

* Updating Debian config

* RedHat: Made AddDefaultCharset Directive configurable

* Added description of apache:lookup:default_charset to pillar.example, sane default equals former hardcoded UTF-8

Add gitignore, kitchen-ci files
Add some tests and documentation

Sometimes it's necessary optimization in nginx+apache2 environment

Added example shows 503 code instead of "It works!" page.

- Added more modules and configuration options
 - Renamed sls files to reflect what they do.
 - added mpm options for Debian