ABOUT QE TESTS
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QE tests are handled uniquely for now:
 - they are not run in parallel because they may modify all VC objects
 - a specific datacenter is not created for each test; only the hostpool
   datacenter will exist when the QE tests are started. An extra datacenter
   seemed to cause trouble for some of the QE tests.
 - all other infrastructure/VC setup done by the test-vpx framework doesn't
   happen for the QE tests (moving hosts in and out of the hostpool, etc).

Once/if QE changes these tests to run within a single datacenter, we can run
the QE tests in parallel.
