Allow providers to override glean behaviour
and update glean address on local interface MAC change

Change-Id: I530826d60c7e9db2b0fa2d45754139d82c5ea807
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index 7516aec..b197aa1 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -1453,8 +1453,10 @@
 
   switch (adj->lookup_next_index)
     {
-    case IP_LOOKUP_NEXT_ARP:
     case IP_LOOKUP_NEXT_GLEAN:
+      adj_glean_update_rewrite (ai);
+      break;
+    case IP_LOOKUP_NEXT_ARP:
       /*
        * default rewirte in neighbour adj
        */