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

Gerrit User 22348 50e82d455b Update patch set 4 ... Patch Set 4: -Verified Starting gate jobs. Patch-set: 4 Tag: autogenerated:zuul:gate		2020-05-04 09:19:05 +00:00
0607b6520e9883c74384969510626aa9913d3bb9	Update patch set 2	2020-04-22 06:52:00 +00:00