Quagga: Fix code to use srandom/random

Quagga was using a mix of srand/rand and srandom/random.
Consolidate to use srandom/random which are the POSIX
versions of random number generators

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/bgpd/bgp_main.c b/bgpd/bgp_main.c
index ad4de79..7c2988c 100644
--- a/bgpd/bgp_main.c
+++ b/bgpd/bgp_main.c
@@ -420,7 +420,7 @@
   master = bm->master;
 
   /* Initializations. */
-  srand (time (NULL));
+  srandom (time (NULL));
   signal_init (master, array_size(bgp_signals), bgp_signals);
   zprivs_init (&bgpd_privs);
   cmd_init (1);