Kernel route syncer supports multiple tables.

The changes are just too extensive for lazy me to list them
there, but see the comment at the top of sysdep/unix/krt.c.
The code got a bit more ifdeffy than I'd like, though.

Also fixed a bunch of FIXME's and added a couple of others. :)

nest/route.h

@@ -109,6 +109,7 @@ struct rtable_config {
   node n;
   char *name;
   struct rtable *table;
+  struct proto_config *krt_attached;	/* Kernel syncer attached to this table */
 };
 
 typedef struct rtable {