Ignore user service on systemd

Instead emit warning about the need to log out and log in again

sau/services.py

@@ -141,6 +141,8 @@ def restart_services():
                 continue
             elif unit_type != 'service':
                 log.warning(f'not restarting non-service unit "{unit}"; owner of {proc}')
+            elif name.startswith('user@'):
+                log.warning(f'Not restarting user service {unit}; please log out and log in again')
             else:
                 _ret, enabled, _err = sau.helpers.exec_cmd([ '/usr/bin/systemctl', 'is-enabled', unit ])
                 enabled = enabled.strip()