Remove entry point of sahara tempest plugin
Remove entry point of sahara tempest plugin

In patch [1], tempest-like test of sahara client has been removed.
But in setup.cfg, there still is entry point of it. Remove it!

[1]:https://review.openstack.org/#/c/367980/

Change-Id: I802e27b91486baa43286bc949e304448ad1610f1

tellesnobrega/sahara,tellesnobrega/sahara,egafford/sahara,openstack/sahara,egafford/sahara,openstack/sahara