tidy up motor_session, initialise pigpiod

MotorControl/gpiozero/motor_session.py

@@ -1,12 +1,11 @@
 import os
 from gpiozero import Servo, Device
 from gpiozero.pins.pigpio import PiGPIOFactory
-
-GPIOZERO_PIN_FACTORY = "piggpio"
+import subprocess
 
 class Motor:
     def __init__(self, motor_pin=19):
-        # This may not work properly, should print.
+        subprocess.call(['sudo', 'pigpiod'])
         Device.pin_factory = PiGPIOFactory()
         print('Using pin factory:')
         print(Device.pin_factory)