GBP Endpoint Updates

- common types on the API
- endpoints keyed in various ways for DP lookup
- conparison functions for VPP IP address types

Change-Id: If7ec0bbc5cea71fd0983fe78987d147ec1bd7ec8
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

test/test_abf.py

@@ -2,7 +2,8 @@
 
 from framework import VppTestCase, VppTestRunner
 from vpp_udp_encap import *
-from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, DpoProto
+from vpp_ip import DpoProto
+from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable
 
 from scapy.packet import Raw
 from scapy.layers.l2 import Ether, ARP