OpenStack - Ensure inventory is collected for all tenants.

@Fryguy @blomquisg please review.

For OpenStack refresh, ensure inventory is collected for all of the
tenants the EMS can access.

Extended OpenstackHandle to include tenant iterators.
Updated EmsOpenstack and the openstack parser to use the OpenstackHandle accordingly.
Updated spec tests and rerecorded vcr cassettes.
I agree @roliveri it's frustrating but I'd rather we do the right thing across the board and possibly enhance the output to make it easier to troubleshoot CI vs. local testing with VCR.

I'll let @brandondunne @blomquisg comment as I don't really have the experience with VCR to know why it's set one way locally and another in CI and the benefit of doing it that way.  I only point out that it's inconsistent if some tests change the logic.  If it doesn't make sense, it should be "false" globally and not in a subset of tests.