HA features in broker conf

Hi,

I would like to use puppet with the HA features of OpenShift.
This is the first Pull Request that add customization on the broker configuration files, for HA feature.

Cheers
To avoid, merging issues with #312 I can remove the following commit from my PR: 
* https://github.com/worldline/openshift-puppet/commit/db7f9c255c587bb5062620db7e6da7f3ffbf474b
* https://github.com/worldline/openshift-puppet/commit/34b13829efe54c5c47e84b8f61f2064dc961f079
* https://github.com/worldline/openshift-puppet/commit/eeee7859de9727272309813f00b1780ec6f14d08
* https://github.com/worldline/openshift-puppet/commit/1533d8e64e7d753f63a2f0fde88cc35ff0e5c631