BZ #1084534 -  Add Nova Service to HA hostgroup.

https://bugzilla.redhat.com/show_bug.cgi?id=1084534
BZ #1075818 - Fixes for HA load  balancer.

https://bugzilla.redhat.com/show_bug.cgi?id=1075818

- Use new VIP define
- Move params to params.pp
- add backend block to quickstack::load_balancer
Merge pull request #155 from jguiditta/ha_nova

Ha nova