Updated openstack/openstack
Project: openstack/heat  fde198bd50161e61f2032005cbce8c29757cc34c

Implement custom constraint for nova server

Many resources have 'InstanceId' property related
with nova server, add nova server custom constraint
to validate the existent of the server.

Change-Id: I4ee5a392488f26b2de708412d58f9c206d6f2c43
Implements: blueprint nova-custom-constraints