bgpd: honor disable-connected-check option with next hop tracking

Make bgpd ignore connected state again if configured to do so.
diff --git a/bgpd/bgp_fsm.c b/bgpd/bgp_fsm.c
index 2e07d93..7da63ea 100644
--- a/bgpd/bgp_fsm.c
+++ b/bgpd/bgp_fsm.c
@@ -716,7 +716,8 @@
     }
 
   /* Register to be notified on peer up */
-  if ((peer->ttl == 1) || (peer->gtsm_hops == 1))
+  if ((peer->ttl == 1 || peer->gtsm_hops == 1) &&
+      ! CHECK_FLAG (peer->flags, PEER_FLAG_DISABLE_CONNECTED_CHECK))
     connected = 1;
 
   bgp_find_or_add_nexthop(family2afi(peer->su.sa.sa_family), NULL, peer,