Fix for a breaking "ipaddress" API change

# Configure for the best backend

if ipaddress:

	net_factory = ipaddress.ip_network

	addr_factory = ipaddress.ip_address

	def net_factory(network):

		"""Return an ipaddress.ip_network which takes a unicode argument"""

		if isinstance(network, bytes):

			network = network.decode()

		return ipaddress.ip_network(network)

	def addr_factory(address):

		"""Return an ipaddress.ip_address which takes a unicode argument"""

		if isinstance(address, bytes):

			address = address.decode()

		return ipaddress.ip_address(address)

elif netaddr:

	net_factory = netaddr.IPNetwork

	addr_factory = netaddr.IPAddress