Error message missing tenant id

The code just doesn't render the string correctly, adding the tenant
id. Also, since this is a message that causes us to throw an
exception, I've changed it from LOG.debug to LOG.error.

Change-Id: Iafd5ba3cf12df9c60c491d39677231eee8be0a42
Closes-Bug: #1459067

trove/common/auth.py

@@ -66,8 +66,11 @@ class TenantBasedAuth(object):
                         "%(request)s") %
                       {'tenant_id': tenant_id, 'request': request}))
             return True
-        msg = _("User with tenant id %s cannot access this resource")
-        LOG.debug(msg % tenant_id)
+
+        msg = _(
+            "User with tenant id %s cannot access this resource.") % tenant_id
+
+        LOG.error(msg)
         raise webob.exc.HTTPForbidden(msg)