Don't stop create immediately on error for stack resources

Don't stop create immediately on error for stack resources,
such as autoscalingGroup.

Kicked from Gate, heat can't pass pep8.

Change-Id: I0a41954f89e2000785c2105b8366e9e49858b65f
Closes-bug: #1383645
Merge "Don't stop create immediately on error for stack resources"