BZ #1086934 - Add Horizon service to HA hostgroup.

https://bugzilla.redhat.com/show_bug.cgi?id=1086934
HA Config fixes.

- make haproxy logger match mode
- bump up qpid/nova heartbeat settings.
- set default logger to avoid warnings.
- use str2bool_i in openstack::keystone call.
- order/conf fixes in quickstack::nova.
Merge pull request #163 from jguiditta/ha_horizon

Ha horizon