BZ #1126447 - Fix nova scheduler constraints for A/P

https://bugzilla.redhat.com/show_bug.cgi?id=1126447

When setting the scheduler to A/P, the resource name is different than when it
is A/A.  Update constraint creation to account for this.
Merge pull request #356 from jguiditta/bz1126447-ap-scheduler

BZ #1126447 - Fix nova scheduler constraints for A/P