BZ #1125301 - Add heat-engine to cloudwatch colo constraint

https://bugzilla.redhat.com/show_bug.cgi?id=1125301

Add a colocation constraint from heat-engine to heat-api-cloudwatch

jayg: changed resource name to 'openstack-heat-api-cloudwatch-clone' and verifed
functional.

Signed-off-by: Jason Guiditta <jguiditt@redhat.com>
Merge pull request #353 from jguiditta/bz1125301-heat-colo

BZ #1125301 - Add heat-engine to cloudwatch colo constraint