Updated openstack/openstack
Project: openstack/heat  7179123b0bb650f41d888d5224be37090eae1545

Rename the remaining instance group tests for clarity

In preparation to move these tests to functional tests rename and
document what they do.
This also simplifies the launch config test as it does not need
the scaling group for this test.

Part of blueprint decouple-nested
Change-Id: I77d7fb38b852590a3004532d28b9b9fcf29dc819