This is to unblock the stuck gate due to the lower_constraints
job failing.
NOTE(lyarwood): This change also drops the nova-ceph-multistore job
while we work on fixing it via Iebbb2dcb767ecf3c965f34f1ca04af20a2039be1
Change-Id: Ifd55c44fef4e2187052d77084dc9c0fa9c9a0d16
(cherry picked from commit 795dad7633)