Updated openstack/openstack
Project: openstack/tempest  1220ba949cdb1e4cda1a3db77595e9136d1ce93c

Fix "NotFound" error in _clear_stacks()

_clear_stacks() will raise "NotFound" exception if stack was
deleted before wait its status. This patch adds a try block
to fix the problem.

Change-Id: I29d4e443e5f355dbba188ccebe930f9401f3ccea
Closes-Bug: #1355666