[cli][supervise] check the real mac address

pyheatpump/cli.py

 def supervise(since):
     logger = logger_init()
 
-    from .config import config
+    from .config import config, mac_address_init
+    mac_address = config.get('heatpump','mac_address')
+    if mac_address == 'None':
+        mac_address = mac_address_init()
+
     from .models.heatpump import Heatpump
 
     last_update = None
     if since:
         last_update = int(datetime.now().strftime('%s')) - config.getint('supervisor', 'interval')
 
-    h = Heatpump(config.get('heatpump','mac_address'), last_update)
+    h = Heatpump(mac_address, last_update)
 
     base_url = {
         'scheme':config.get('supervisor', 'scheme'),