As discussed and approved during the ironic wallaby midcycle, the grenade
jobs in old stable branches, starting from EM branches and up the oldest
not-EM (at this moment train) are removed.
Remove lower-constraints job.
Also adds a backport with the fix for paramiko.
Pin tempest to version 23.0.0 in Python 2.7 job.
Disable long time broken multinode job (also disabled in ironic).
Co-Authored-By: Ghanshyam Mann <email@example.com>
(cherry picked from commit