Updated openstack/openstack
Project: openstack/heat  b5873e170dc08c375c7416f8ae180b5d66f097d0

Stop periodic watcher tasks before deleting stack

In the case where a stack that has a watch task associated with it is
being deleted and the engine successfully acquires a lock, no attempt to
stop the stack will be made since it has no action in-progress.  This
will result in orphaned watcher tasks being left behind, since the
watcher tasks are normally stopped as part of the call to
ThreadGroup.stop().

To fix this, explicitly stop the periodic watcher tasks before calling
stack.delete().

Change-Id: Idf5b7c1100fc85743ac6dc5831731f7ecc96bfd6
Closes-Bug: #1315044