tempest-cleanup can only be invoked as tempest cleanup

The CLI entry point removed here points to the main() class which was removed
so that tempest-cleanup is not a standalone command anymore.

See I2119acd402b0985d4a81c85501ce7265f782d37b

Change-Id: I3421667916bf3652ab0e777fa78c382a3f6e849d
2 files changed