ACU: rename restart_idle to idle_reset and make it work

In latest LAT, you need to do something (anything) on the command
interface to prevent Survival mode.  This will launch on startup *for
LATs*, unless --disable-reset-idle is passed.

socs/agents/acu/agent.py

@@ -991,7 +991,6 @@ def _stop(self, all_axes=False):
         yield self._set_modes('Stop', 'Stop', 'Stop')
 
     def _get_limit_func(self, axis):
-
         """Construct a function limit(x) that will enforce that x is within
         the configured limits for axis.  Returns the funcion and the
         tuple of limits (lower, upper).