sleep_test network manager dbus listen code never exits if network manager doesn't reconnect

Code was added to the sleep_test script that checks network manager to see if network manager has reconnected after a suspend or hibernate.

This works fine if there is a cable plugged in or a wi-fi connection set to autoconnect. However, in cases where the network connection is not set to autoconnect, this code goes to sleep and never wakes up, causing the sleep_test script to just sit there forever.

The code in question is this:

340 while True:
341 if nm.get_state() == nm.STATE_CONNECTED:
342 return True
343 # give 60 seconds to NetworkManager to get to a CONNECTED state, then give up
344 if datetime.now() - start > timedelta(60):
345 return False
346 sleep(5)

without digging in too deep, this loop DOES work as long as a connection is re-established at some point, however, it does not exit after 60 seconds giving the appearance that the test script is hung.