Show group-add/remove-member-manager failures

Commands like ipa group-add-member-manager now show permission
errors on failed operations.

Fixes: https://pagure.io/freeipa/issue/8122
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipaclient/frontend.py

@@ -65,6 +65,11 @@ class ClientMethod(ClientCommand, Method):
             'ipamemberca',
             label=_("Failed CAs"),
         ),
+        # group, hostgroup
+        Str(
+            'membermanager',
+            label=_("Failed member manager"),
+        ),
         # host
         Str(
             'managedby',