Fixed naming of expected status of a stack.

Method wait_for_stack_status in heatmanager
was waiting for "ERROR" status as reason
for test interruption but should wait
for "CREATE_FAILED" status.
Similar fix was done in cleanup.py.

Change-Id: Ib9fb5c3df3256328012d23a56bd4f78923724c6c
Closes-Bug: #1260798
Merge "Fixed naming of expected status of a stack."