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

Gerrit User 22348 8038390c57 Update patch set 4 ... Patch Set 4: Verified+1 Build succeeded (check pipeline). - openstack-tox-pep8 https://zuul.opendev.org/t/openstack/build/2e69dfceb405403591c2d118104251b1 : SUCCESS in 3m 26s - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/71768c1608324516a0df50a17722645a : SUCCESS in 4m 01s Patch-set: 4 Tag: autogenerated:zuul:check		2020-04-22 07:02:20 +00:00
0607b6520e9883c74384969510626aa9913d3bb9	Update patch set 2	2020-04-22 06:52:00 +00:00