ospf6d: schedule SPF to run on events rather than directly on each event.

OSPV3 SPF triggers on every SPF-able event instead of using timers the way
OSPFv2 does. This patch makes SPF be triggered/throttled similar to OSPFv2.
It adds a command to quagga identical to the OSPFv2 equivalent to configure
these timers.
Summary:

Signed-off-by: Dinesh Dutt <ddutt at cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma at cumulusnetworks.com>
[DL: removed reference to oa->ts_spf for rebase]
[DL: killed timeval_subtract]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/ospf6d/ospf6_area.c b/ospf6d/ospf6_area.c
index 2d20e62..1e07d85 100644
--- a/ospf6d/ospf6_area.c
+++ b/ospf6d/ospf6_area.c
@@ -67,7 +67,7 @@
           zlog_debug ("Schedule SPF Calculation for %s",
 		      OSPF6_AREA (lsa->lsdb->data)->name);
         }
-      ospf6_spf_schedule (OSPF6_AREA (lsa->lsdb->data));
+      ospf6_spf_schedule (OSPF6_PROCESS(OSPF6_AREA (lsa->lsdb->data)->ospf6));
       break;
 
     case OSPF6_LSTYPE_INTRA_PREFIX:
@@ -97,7 +97,7 @@
           zlog_debug ("Schedule SPF Calculation for %s",
                      OSPF6_AREA (lsa->lsdb->data)->name);
         }
-      ospf6_spf_schedule (OSPF6_AREA (lsa->lsdb->data));
+      ospf6_spf_schedule (OSPF6_PROCESS(OSPF6_AREA (lsa->lsdb->data)->ospf6));
       break;
 
     case OSPF6_LSTYPE_INTRA_PREFIX: