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_p2p_ethernet.py

@@ -11,7 +11,8 @@ from scapy.layers.inet6 import IPv6
 
 from framework import VppTestCase, VppTestRunner
 from vpp_sub_interface import VppP2PSubint
-from vpp_ip_route import VppIpRoute, VppRoutePath, DpoProto
+from vpp_ip import DpoProto
+from vpp_ip_route import VppIpRoute, VppRoutePath
 from util import mactobinary