OpenStack host maintenance and upgrade in interaction with application on top of it

Gerrit User 22348 af2a820acb Update patch set 5 ... Patch Set 5: Verified+1 Build succeeded (check pipeline). - openstack-tox-pep8 http://logs.openstack.org/41/661241/5/check/openstack-tox-pep8/61c908a/ : SUCCESS in 4m 05s - openstack-tox-docs http://logs.openstack.org/41/661241/5/check/openstack-tox-docs/955e2a2/html/ : SUCCESS in 3m 53s Patch-set: 5 Label: Verified=+1		2019-05-27 07:07:53 +00:00
963aa7981d22a945e14f3981ceafc207e8f233d3	Update patch set 4	2019-05-27 06:41:17 +00:00