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_ism.c b/ospfd/ospf_ism.c
index 3172587..db53882 100644
--- a/ospfd/ospf_ism.c
+++ b/ospfd/ospf_ism.c
@@ -578,20 +578,17 @@
     oi->area->act_ints++;
 
   /* schedule router-LSA originate. */
-  ospf_router_lsa_timer_add (oi->area);
+  ospf_router_lsa_update_area (oi->area);
 
   /* Originate network-LSA. */
   if (old_state != ISM_DR && state == ISM_DR)
-    ospf_network_lsa_timer_add (oi);
+    ospf_network_lsa_update (oi);
   else if (old_state == ISM_DR && state != ISM_DR)
     {
       /* Free self originated network LSA. */
       lsa = oi->network_lsa_self;
       if (lsa)
-	{
-	  ospf_lsa_flush_area (lsa, oi->area);
-	  OSPF_TIMER_OFF (oi->t_network_lsa_self);
-	}
+        ospf_lsa_flush_area (lsa, oi->area);
 
       ospf_lsa_unlock (&oi->network_lsa_self);
       oi->network_lsa_self = NULL;