Use a more specific match for changing to worker

httpd from centos.alt.ru has both #HTTPD=/usr/sbin/httpd.worker and
confused
Add Serverspec matchers
removing mod_disk_cache from list of default mods on redhat

While it is indeed loaded on a stock redhat-family apache install, it's not actually enabled, so it shouldn't be listed as a default here.
Remove all mods from default_mods that aren't actually default on redhat
Removing all proxy mods from default_mods on redhat

…since we were forced to remove mod_proxy, and these mods depend on it
fixing tests to match new behavior
Removing mod_authnz_ldap from default_mods since mod_ldap is now removed
Disable selinux first
Add system tests for prefork / worker mpm module
Correct cgi/cgid loading on worker/prefork
Merge pull request #263 from hunner/worker_multiple_matches

Use a more specific match for changing worker/prefork
Release 0.8.1

Bugfixes:
- Update `apache::mpm_module` detection for worker/prefork
- Update `apache::mod::cgi` and `apache::mod::cgid` detection for
  worker/prefork
Merge pull request #269 from hunner/release_0.8.1

Release 0.8.1
(#272) Add parameter sslproxyengine to vhost.pp

In order to use mod_proxy with remote servers using the SSL/TLS protocol it is
needed to activate the SSL/TLS Protocol Engine for proxy. Setting this
parameter to true adds the directive `SSLProxyEngine on` to the virtual host.
Remove sendfile comment

The comment in the conditional block for sendfile directive inclusion
caused the plain text directive name to not be included in the script.
(#278) Ports file attempted to be created before Apache installed

Ports file creation should depend on Apache being installed.
Add KeepAlive parameter

KeepAlive parameter was added to init.pp (by default is equal apache::params::keepalive), params.pp (by default is 'Off') and template httpd.conf.erb
Desription was added to README.md
Test against facter 1.6
Merge pull request #282 from hunner/update_facter_travis

Test against facter 1.6
Merge pull request #280 from thegriglat/master

Add KeepAlive parameter