Remove parameters for the following tempest plugins. Support for these
plugins were deprecated[1] during the previous cycle.
- ec2api-tempest-plugin
- murano-tempest-plugin
- sahara-tests
[1] da173126db0be67f9bb3bf1f6c30c036eec75e0d
Change-Id: Ib135a32304d26f98e430d739216984c948192a8c