Fix CLI configs get test for plugins with more versions
Fix CLI configs get test for plugins with more versions

When more versions are available for a certain plugin, only one of them
should be passed to the test.
The test could also try all the versions and all the plugins, but this
is a discussion of another review.

Change-Id: I32351c7bb240058727b21ab8ea3536cc2bf45a2a

openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-tests