Set bay status: DELETE_IN_PROGRESS before updated by poll
Set bay status: DELETE_IN_PROGRESS before updated by poll

Set bay status to DELETE_IN_PROGRESS as soon as delete stack
request returns. Currently this status is updated by Heat
poller.

Change-Id: I44a3cea1a5d6e9735b0b74637d7c62db2e9cffa3
Closes-Bug: #1612408

openstack/magnum,ArchiFleKs/magnum,ArchiFleKs/magnum,openstack/magnum