Another step to migrate to new CI

Change-Id: Id9bf9b4b1114f5be66f6c028a0db16d869efeceb
Depends-On: Iaacdca31b27b7033ec08499bcea7061b9d3ec279

Change-Id: Id71c1ecda9f8647a0eb290fe02a12afb3df09988

Partial-Bug: #1720601
Change-Id: Ibc20a6ae8c645ff82f3c14a6286073dffd4cfae2

First non-trivial scenario we'll be testing in gates will be cinder +
ceph. This patchset is supposed to create framework to easily add new
testing scenarios.

Change-Id: I6790eaf5cf3297af04a64e4169a39b6e2cd1890f

This reverts commit 94a882ba.

Upstream has fix this issue by Ice89ad9dd486ad5fcac534ef5f7d8aae3b6b0f97

Change-Id: Ib17f93e4030c6f7da4e32ee84fcc5f7139e57895
Closes-Bug: #1694420

This patches changes deploy_gate quite a bit so in reality all
deployments will now assume multinode (even if it's single node). After
that we will refactor it even further to enable easy addition of new
scenerios.

Change-Id: I1faada46e6a7aa026128b2f01d77eabb04759439