This change implements missing external_upgrade_tasks for non-pcmk
services of manila and cinder, to ensure that we don't have mixed
versions of controller services running at the same time during
upgrade.
These tasks should have been implemented in the initial patch[1], but
missed at that time unfortunately.
[1] 8529ce60da
Change-Id: I35ea4354a7448a23d6517f9777ed022caa79347a
(cherry picked from commit 60c22c38cc)
0223e9ab63