Clarify convergence logging
Clarify convergence logging

Change-Id: I9b1ff6b693ca4a0681ff38ed96f35d4635823f67
Closes-Bug: #1512750

openstack/heat,dragorosson/heat,gonzolino/heat,steveb/heat,cwolferh/heat-scratch,steveb/heat,dims/heat,gonzolino/heat,dims/heat,noironetworks/heat,openstack/heat,jasondunsmore/heat,jasondunsmore/heat,noironetworks/heat,cwolferh/heat-scratch,dragorosson/heat