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_bier.py

@@ -4,9 +4,10 @@ import unittest
 import socket
 
 from framework import VppTestCase, VppTestRunner, running_extended_tests
+from vpp_ip import DpoProto
 from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsRoute, \
     VppMplsTable, VppIpMRoute, VppMRoutePath, VppIpTable, \
-    MRouteEntryFlags, MRouteItfFlags, MPLS_LABEL_INVALID, DpoProto, \
+    MRouteEntryFlags, MRouteItfFlags, MPLS_LABEL_INVALID, \
     VppMplsLabel
 from vpp_bier import *
 from vpp_udp_encap import *