Add test to validate multi _ heat stack_status
Add test to validate multi _ heat stack_status

According to the Heat API docs, there is a status of IN_PROGRESS which
can cause the old code to fail. Add a test that sets that stack_status
so that we ensure we don't regress on splitting the stack_status.

Change-Id: Ibb1143ffd47465d1640f17bf4319425e6db1f4d1

dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,dtroyer/python-openstacksdk