bgpd: Improve peer scaling

Reduce the amount of time it takes to bring up a large number of peers.

This is accomplished by removing jitter and reducing the number
of seconds to wait before connecting to a peer.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>

Edited-by: Paul Jakma <paul.jakma@hpe.com> for rebase conflicts, and to add
           jitter on connect timer back in. Can be removed in an update.
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index 7bd5a78..3f6161c 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -748,7 +748,7 @@
 #define BGP_EVENTS_MAX                          15
 
 /* BGP timers default value.  */
-#define BGP_INIT_START_TIMER                     5
+#define BGP_INIT_START_TIMER                     1
 #define BGP_DEFAULT_HOLDTIME                   180
 #define BGP_DEFAULT_KEEPALIVE                   60 
 #define BGP_DEFAULT_EBGP_ROUTEADV               30