Change-Id: If5b4ba975a65e07d2704eb6bdb9d841d6a9c3d42

the bug[0] has beed fix, restart container is unncessary, remove it
is safe.

[0]: https://bugs.launchpad.net/oslo.cache/+bug/1590779

Change-Id: Iadfb3666bad8160b5c071fa1a512e2dcdda84043

Switch the CI test script to use the openstack command rather than nova
etc.

Change-Id: Id1c6d35e1e50987d230adb7942da6a7ae5c0f050

This change is intended to ease the addition of new test scenarios, by
splitting the existing setup_gate.sh script up into several smaller
scripts. We may wish to further break these scripts up in future,
depending on the requirements of new test jobs.

Change-Id: Ifa442ac79a54f749c56d20f5f7383c3852d95268