[Tempest] HotFix for broken CI jobs
[Tempest] HotFix for broken CI jobs

Recently merged commit to "neutron-fwaas" project [1] started using
one of Tempest's modules that appeared after version our plugin uses.
So, implement hotfix-workaround until we make all compatibility changes
to latest Tempest in our plugin.

For the moment, we cannot switch to latest Tempest as we already
have incompatibility for it, see bug [2].

[1] https://review.openstack.org/#/c/326150/
[2] https://bugs.launchpad.net/manila/+bug/1586129

Change-Id: I44655c83cc5588c5b94d0fad81162dd0c238b5b4
Closes-Bug: #1589964

vponomaryov/manila,bswartz/manila,vponomaryov/manila,bswartz/manila,openstack/manila,NetApp/manila,NetApp/manila,openstack/manila