This patch removes MongoDB beaker tests as this is not a well
tested use-case and sticks to the Swift/SQLalchemy configuration
which is well tested. It switches Beaker to use the same resources
in integration.
Depends-On: Ic1a4ea20ef65a832a986964fb61e80c4738740b5
Change-Id: I9796a7bb2f25a2df53a1aeeb2814a91ca2c2cbec