Remove force_tenant_isolation=True from test that doesn't need it

Remove extraneous force_tenant_isolation=True tag in trove base

Change-Id: I9e76681172bf55e081870cae8a4d806e8c876de4
Merge "Remove force_tenant_isolation=True from test that doesn't need it"
Merge branch 'master' of https://github.com/openstack/tempest