Don't log ERROR for remote stack exceptions
Don't log ERROR for remote stack exceptions

These are user triggered so shouldn't be logged as ERROR.

Change-Id: If2ee3b44bf85d55c4eb99e361c14d06e522d26f2
Partial-Bug: #1606404

openstack/heat,noironetworks/heat,cwolferh/heat-scratch,noironetworks/heat,cwolferh/heat-scratch,openstack/heat