Remove Sahara CLI tests (migrated)

The tests have been migrated to the python-saharaclient repository.
Also, remove python-saharaclient from requirements.

Change-Id: Ia027fcfff4d643effa85dfd55dafe12bfdd6fba8
Depends-On: I3f1b1fafc0f8dccbe13783271894d60d4567e4cc
3 files changed