Remove --tenant suggestion for flavor-access-list

when help flavor-access-list, nova client tells user to
try --tenant while try with it , nova client tells user
it's not implemented. We should avoid this kind of suggestion.

Change-Id: Ia35f9d35d6c4855122385de2a5cc013fcba1f126
Closes-Bug: 1515978

novaclient/v2/shell.py

@@ -807,7 +807,7 @@ def do_flavor_access_list(cs, args):
         kwargs = {'tenant': args.tenant}
     else:
         raise exceptions.CommandError(_("Unable to get all access lists. "
-                                        "Specify --flavor or --tenant"))
+                                        "Specify --flavor"))
 
     try:
         access_list = cs.flavor_access.list(**kwargs)