Update contrib/ci  bash scripts

Actions from setup.sh files are supposed
to be moved to job itself. All changes needed only for tempest
are stored in post_test_hook.

So, no need to keep these files.
When files from multi_backend become not used, they
should be removed too.

Change-Id: I3da41e2843de3e2dfaf4952aea5f7e00a6ff9940
Merge "Update contrib/ci  bash scripts"