BZ #1084534 - full nova class paths, avoid HA naming conflict

https://bugzilla.redhat.com/show_bug.cgi?id=1084534

Standalone host groups need to use fully qualified nova paths in class
declarations or can end up using quickstack::nova.
Merge pull request #160 from cwolferh/declare_nova_with_fully_qualified_name

BZ #1084534 - full nova class paths, avoid HA naming conflict