Replace legacy-tempest-dsvm-lvm-multibackend with its native version,
cinder-tempest-lvm-multibackend.

Remove legacy-tempest-dsvm-neutron-dvr-multinode-full, which was defined
as an experimental job in neutron and removed during the ussuri lifecycle.
See https://review.opendev.org/#/c/693630/

Change-Id: I76d1efaa3a6c1fe9825e8457438f514114b2ecad
(cherry picked from commit 0cbbefc0)