With Ephemeral Heat, we can no longer call
the Heat API while removing nodes, nor is it
necessary. This change removes all calls to
Heat and instead just executes the required
playbooks to perform the scale down actions.
Conflicts:
tripleoclient/tests/v1/overcloud_node/test_overcloud_node.py
tripleoclient/workflows/scale.py
Change-Id: Iba56d41d132275bd55e77290a6fca87b917de9e9
(cherry picked from commit 87dbe9f6d4)
71633a13f9