isolate and characterize the existing behavior
give preference to returning UP instances if any exist
Only return running instances
Move logic to a service where it can be shared by controllers.
Look for healthy instances for autoscaling/anyInstance just like cluster/anyInstance.
ASGARD-909 More accurate http codes returned for anyInstance actions.
Merge pull request #227 from claymccoy/anyUpInstance

ASGARD-945 cluster/anyInstance should prefer UP instances