The pool-manager has been deprecated since Newton and
is now being removed with the Train release.
Change-Id: Ib258043d492bb25e1c061d765b40885317c73804
This patch will not remove the existing Devstack integration
in contrib/devstack.
Change-Id: I23ef00bb136e92abc5e69a9bbe1093cad9d2a362
Closes-bug: #1504214