This is cleaned up as of commit
2351d624aed7aae9d58ce37676c0181687be0e8a, and should be sufficient for
the final release. If something else with a release note lands, we can
make any changes there in a later patch.
Change-Id: Ia1ef442f3cc0d64c8a7c6fbb5aaf3f0160f214de
As of nova's Newton release, the ironic virt driver supports multiple
compute hosts without using the hack we call ClusteredComputeManager.
Deprecate it so we can remove it in Ocata.
Change-Id: I9c44429666734e5bdbe60b3ff8bba787ff99a6d1