Comment 0 for bug 1632054

Following are a few observations:

1. Even though Listener was created with ERROR status, heat will still go
ahead and mark it Creation Complete. As in the heat code, it only check
whether root Loadbalancer status is change from PENDING_UPDATE to ACTIVE.
And Loadbalancer status will be changed to ACTIVE anyway no matter
Listener's status.

2. As heat engine wouldn't know the Listener's creation failure, it will
continue to create Pool\Member\Heatthmonitor on top of an Listener which
actually doesn't exist. It causes a few undefined behaviors. As a result,
those LBaaS resources in ERROR state are unable to be cleaned up
with either normal neutron or heat api.