ip: Protocol Independent IP Neighbors

Type: feature

 - ip-neighbour: generic neighbour handling; APIs, DBs, event handling,
aging
 - arp: ARP protocol implementation
 - ip6-nd; IPv6 neighbor discovery implementation; separate ND,
MLD, RA
 - ip6-link; manage link-local addresses
 - l2-arp-term; events separated from IP neighbours, since they are not
the same.

vnet retains just enough education to perform ND/ARP packet
construction.
arp and ip6-nd to be moved to plugins soon.

Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe
Signed-off-by: Neale Ranns <nranns@cisco.com>

src/plugins/srv6-ad/test/test_srv6_ad.py

@@ -115,7 +115,7 @@ class TestSRv6(VppTestCase):
         if any(ipv6):
             self.logger.debug(self.vapi.cli("show ip6 neighbors"))
         if any(ipv4):
-            self.logger.debug(self.vapi.cli("show ip arp"))
+            self.logger.debug(self.vapi.cli("show ip4 neighbors"))
         self.logger.debug(self.vapi.cli("show interface"))
         self.logger.debug(self.vapi.cli("show hardware"))