Update the MT hexapod and rotator CSCs to read command ack messages from the low-level controller.

Note that these acks may arrive before the command actually takes effect (the state is changed, motion begins, etc.). Thus for now I must leave in the code that checks the telemetry for the desired state change. Eventually I hope command ack will arrive after the command is done (or in the case of point-to-point move or stop, after that begins, at which point I can ignore the telemetry.

The only changes required are in ts_hexrotcomm.