Update the stack state as late as possible
Update the stack state as late as possible

The event and notifications do not look the stack up in
the DB so we can rely on the in memory status.

Change-Id: Iceb9bf6fa86f7f5ada7d3a8672788f09a48b1f43
Partial-Bug: #1450314

rh-s/heat,takeshineshiro/heat,miguelgrinberg/heat,takeshineshiro/heat,noironetworks/heat,dims/heat,pratikmallya/heat,steveb/heat,cryptickp/heat,rdo-management/heat,rdo-management/heat,srznew/heat,miguelgrinberg/heat,maestro-hybrid-cloud/heat,noironetworks/heat,openstack/heat,pshchelo/heat,rh-s/heat,gonzolino/heat,pratikmallya/heat,cwolferh/heat-scratch,jasondunsmore/heat,cryptickp/heat,openstack/heat,dragorosson/heat,dragorosson/heat,jasondunsmore/heat,gonzolino/heat,cwolferh/heat-scratch,dims/heat,pshchelo/heat,srznew/heat,maestro-hybrid-cloud/heat,steveb/heat