When using both /run and /run/netns in docker container, mount
propagation won't work when delete namespace after the containers are
restarted. This PS makes /run mount as shared.
Closes-Bug: #1616268
Change-Id: Ie16699e1b193b2bf1263d89ea634e89ea69add9e
Useful for upgrade etc., which is preferablly done serially.
Example usage: tools/kolla-ansible deploy OR tools/kolla-ansible upgrade
Closes-Bug: #1576708
DocImpact
Change-Id: I34b2e16f8ce53e472a4682a4738c4ac0f5abf00c