ospf6d: Have ospf6d cleanup when it terminates normally

A clean exit makes it easier to use memory debuggers.

* ospf6_asbr.c: (ospf6_asbr_terminate) Add a function to do route map
  cleanup.
* ospf6_lsa.c: (ospf6_lsa_terminate) Add a function to cleanup the lsa
  handler vector.
* ospf6_main.c: (ospf6_exit) Add an function that causes ospf6d to
  gracefully exit.
* ospf6_message.c: (ospf6_message_terminate) Add a function that frees
  the send and receive buffers.
* ospf6_top.c: (ospf6_delete) Enable the ospf6_delete() function.
  Disable ospf6 before freeing everything.

Signed-off-by: Vyacheslav Trushkin <me@dogonthesun.net>

Conflicts:

	ospf6d/ospf6_lsa.h
diff --git a/ospf6d/ospf6_asbr.c b/ospf6d/ospf6_asbr.c
index bc05dc2..ae0a286 100644
--- a/ospf6d/ospf6_asbr.c
+++ b/ospf6d/ospf6_asbr.c
@@ -1275,6 +1275,11 @@
   install_element (OSPF6_NODE, &no_ospf6_redistribute_cmd);
 }
 
+void
+ospf6_asbr_terminate (void)
+{
+  route_map_finish ();
+}
 
 DEFUN (debug_ospf6_asbr,
        debug_ospf6_asbr_cmd,