Legacy jobs except grenade job has been migrated
to zuulv3 in - https://review.opendev.org/#/c/644586
But legacy playbooks has been left to remove. Those are
unused now and can be removed from master and train branch.
Change-Id: I1f432c8c99d6a7e695d00baddb9aab795d8685bb
(cherry picked from commit 911f372bbe)