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/adj/adj_internal.h b/src/vnet/adj/adj_internal.h
index e6d276e..3b7ddb2 100644
--- a/src/vnet/adj/adj_internal.h
+++ b/src/vnet/adj/adj_internal.h
@@ -78,6 +78,21 @@
     return (0);
 }
 
+static inline ip46_type_t
+adj_proto_to_46 (fib_protocol_t proto)
+{
+    switch (proto)
+    {
+    case FIB_PROTOCOL_IP4:
+	return (IP46_TYPE_IP4);
+    case FIB_PROTOCOL_IP6:
+	return (IP46_TYPE_IP6);
+    default:
+	return (IP46_TYPE_IP4);
+    }
+    return (IP46_TYPE_IP4);
+}
+
 /**
  * @brief
  * Get a pointer to an adjacency object from its index