Updated openstack/openstack
Project: openstack/tempest  38c0f55bff12def7b59cab3903d216e88b08456b

Cleanup class resources for large-ops scenario

Large Ops scenario is design to test the bulk creation of VMs while multiple
VMs already exist in tenant.
Due to some refactoring in Tempest scenario, the VMs are now deleted at the end
of the individual test cases.

Removes usage of addCleanup() from large-ops scenario.

Adds Class level method - addCleanupClass to cleanup resources at the end of
the test class.

Closes-Bug: #1395759
Change-Id: I612fcfab83a2046b8e597e009e385d7918f943b9