move to ipaddress

Python3.3 introduced a very nice standard library called ipaddress that
serves for a very similar purpose to netaddr. By moving to it, we are
future proofing our code and making Python3 users of kuryr-lib not have
to install an external library.

Change-Id: I9e995b3804e60bea199e150e70f828d5f6e2bed4
Implements: blueprint netaddr-to-ipaddress
Signed-off-by: Antoni Segura Puimedon <antonisp@celebdor.com>

kuryr/lib/binding.py

@@ -12,11 +12,12 @@
 
 import os
 
-import netaddr
+import ipaddress
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_utils import excutils
 import pyroute2
+import six
 
 from kuryr.lib import exceptions
 from kuryr.lib import utils
@@ -137,7 +138,7 @@ def port_bind(endpoint_id, neutron_port, neutron_subnets,
                 if IP_ADDRESS_KEY in fixed_ip and (SUBNET_ID_KEY in fixed_ip):
                     subnet_id = fixed_ip[SUBNET_ID_KEY]
                     subnet = subnets_dict[subnet_id]
-                    cidr = netaddr.IPNetwork(subnet['cidr'])
+                    cidr = ipaddress.ip_network(six.text_type(subnet['cidr']))
                     peer_veth.add_ip(fixed_ip[IP_ADDRESS_KEY], cidr.prefixlen)
             peer_veth.set_mtu(mtu)
             peer_veth.address = neutron_port[MAC_ADDRESS_KEY].lower()

requirements.txt

@@ -3,8 +3,8 @@
 # process, which may cause wedges in the gate later.
 
 Babel>=2.3.4 # BSD
+ipaddress>=1.0.7;python_version<'3.3'  # PSF
 keystoneauth1 >= 2.10.0 # Apache-2.0
-netaddr!=0.7.16,>=0.7.12 # BSD
 neutron-lib>=0.3.0 # Apache-2.0
 oslo.concurrency>=3.8.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0
@@ -13,3 +13,4 @@ oslo.utils>=3.16.0 # Apache-2.0
 pbr>=1.6 # Apache-2.0
 pyroute2>=0.4.3 # Apache-2.0 (+ dual licensed GPL2)
 python-neutronclient>=4.2.0 # Apache-2.0
+six>=1.9.0  # MIT