get_network_driver fails to return custom network driver due to sorting

[emorr-utmck]

My IOSDriver extension was not being returned by get_network_driver due to inspect.getmembers returning sorted output, and the for loop using the first NetworkDriver member, causing the normal napalm IOSDriver to be selected.

Example Failing Code:

from napalm.ios.ios import IOSDriver

class WirelessIOSDriver(IOSDriver):
    """Custom NAPALM driver for Cisco IOS Wireless Controllers."""
    pass

Example Working Code:

from napalm.ios.ios import IOSDriver

class CustomWirelessIOSDriver(IOSDriver):
    """Custom NAPALM driver for Cisco IOS Wireless Controllers."""
    pass