Remove unused fixtures
Remove unused fixtures

DisableModuleFixture and NoModuleFinder fixtures are no more used.

Change-Id: I55a5e106b5d4d618918ee21b33afd0154e22f6b7
(cherry picked from commit e7853b8909358a78b8ae86c075ee234467a0d82f)

jamielennox/keystoneauth,sileht/keystoneauth,citrix-openstack-build/keystoneauth