network_reconnect_resume_test fails when run for wired connection

This script is used to check the length of time it takes for a network interface to come back up after a suspend. At the moment when run for the 'wired' interface it is failing with the following stack trace:

Traceback (most recent call last):
  File "scripts/network_reconnect_resume_test", line 101, in <module>
      sys.exit(main())
  File "scripts/network_reconnect_resume_test", line 87, in main
      timedif = get_time_difference(args.device)
  File "scripts/network_reconnect_resume_test", line 36, in get_time_difference
      if reconnect_time >= resume_time:
  TypeError: unorderable types: str() >= float()

This seems to be because the reconnect_time is actually stored as a string rather than a float.