MODULES-1789 add initial mod_geoip support

[roman-mueller]

This adds support for mod_geoip.
I've tested it on CentOS 6 and 7.

There is one problem with this: if you want to set GeoIPEnable in a directories parameter you must declare the class apache::mod::geoip yourself.
As the directories parameter can be an array of hashes I cannot check for the value of geoip_enable here:

    apache::vhost { 'first.example.com':
      docroot     => '/var/www/first',
      directories => [
        { path         => '/var/www/first',
          geoip_enable => 'On',
        },
      ],
    }

And because of this, I cannot automatically include it.

[igalic]

i know it'll make the variables longer, but can you please under_score them?

[roman-mueller]

@igalic thanks for feedback, didn't know about bool2httpd until now.
Can you check my last commit?

I'm not sure why the build failed now, it says it exceeded 50 minutes.
That sounds like Travis CI is overloaded rather than my change breaking it.

[igalic]

it looks like travis is overloaded, i could restart the jobs and see if that helps…

[igalic]

thanks @roman-mueller!