Don't wait for stack in progress in delete
Don't wait for stack in progress in delete

We don't need to wait for the stack to be in progress when deleting it,
and it can in fact be a race condition if it disappears too fast. Just
skip to check if it still exists.

Change-Id: Idbbb7afd4ab0157c870e1c1e3cd1666fb99651cc

openstack/tripleo-common,openstack/tripleo-common