ospfd: Unify router and network LSA refresh logic with general refresher

* (general) Get rid of the router and network LSA specific refresh timers
  and make the general refresher do this instead. Get rid of the twiddling
  of timers for router/network LSA that was spread across the code.

  This lays the foundations for future, general LSA refresh improvements,
  such as making sequence rollover work, and having generic LSA delays.

* ospfd.h: (struct ospf) Bye bye to the router-lsa update timer thread
  pointer.
  (struct ospf_area) and to the router-lsa refresh timer.
* ospf_interface.h: Remove the network_lsa_self timer thread pointer
* ospf_lsa.h: (struct ospf_lsa) oi field should always be there, for benefit
  of type-2/network LSA processing.
  (ospf_{router,network}_lsa_{update_timer,timer_add}) no timers for these
  more
  (ospf_{router,network}_lsa_update) more generic functions to indicate that some
  router/network LSAs need updating
  (ospf_router_lsa_update_area) update router lsa in a particular area alone.
  (ospf_{summary,summary_asbr,network}_lsa_refresh) replaced by the general
  ospf_lsa_refresh function.
  (ospf_lsa_refresh) general LSA refresh function
diff --git a/ospfd/ospf_abr.c b/ospfd/ospf_abr.c
index 7e32195..7a75194 100644
--- a/ospfd/ospf_abr.c
+++ b/ospfd/ospf_abr.c
@@ -565,8 +565,7 @@
       if (IS_DEBUG_OSPF_EVENT)
 	zlog_debug ("ospf_check_abr_status(): new router flags: %x",new_flags);
       ospf->flags = new_flags;
-      OSPF_TIMER_ON (ospf->t_router_lsa_update,
-		     ospf_router_lsa_update_timer, OSPF_LSA_UPDATE_DELAY);
+      ospf_router_lsa_update (ospf);
     }
 }
 
@@ -760,7 +759,7 @@
             zlog_debug ("ospf_abr_announce_network_to_area(): "
                        "refreshing summary");
           set_metric (old, cost);
-          lsa = ospf_summary_lsa_refresh (area->ospf, old);
+          lsa = ospf_lsa_refresh (area->ospf, old);
           
           if (!lsa)
             {
@@ -1148,7 +1147,7 @@
       if (old) 
 	{ 
 	  set_metric (old, cost);
-	  lsa = ospf_summary_asbr_lsa_refresh (area->ospf, old);
+	  lsa = ospf_lsa_refresh (area->ospf, old);
 	}
       else
 	lsa = ospf_summary_asbr_lsa_originate (p, cost, area);