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_interface.c b/ospfd/ospf_interface.c
index a812dd9..dc0787d 100644
--- a/ospfd/ospf_interface.c
+++ b/ospfd/ospf_interface.c
@@ -97,7 +97,7 @@
       if (oi->output_cost != newcost)
 	{
 	  oi->output_cost = newcost;
-	  ospf_router_lsa_timer_add (oi->area);
+	  ospf_router_lsa_update_area (oi->area);
 	}
     }
 }
@@ -298,8 +298,6 @@
   ospf_nbr_delete (oi->nbr_self);
   oi->nbr_self = ospf_nbr_new (oi);
   ospf_nbr_add_self (oi);
-  
-  OSPF_TIMER_OFF (oi->t_network_lsa_self);
 }
 
 void
@@ -1121,8 +1119,8 @@
              if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
                zlog_debug ("ospf_vl_up_check: VL cost change,"
                           " scheduling router lsa refresh");
-             if(ospf->backbone)
-               ospf_router_lsa_timer_add (ospf->backbone);
+             if (ospf->backbone)
+               ospf_router_lsa_update_area (ospf->backbone);
              else if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
                zlog_debug ("ospf_vl_up_check: VL cost change, no backbone!");
            }