bgpd, zebra: Fix format for some metric outputs

Metrics are unsigned values.

  * bgpd/bgp_{debug,route,vty}.c,
  * zebra/zebra_vty.c: replace %d with %u for metrics & distances

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
[reworded commit message]
Signed-off-by: David Lamparter <equinox@diac24.net>
diff --git a/bgpd/bgp_debug.c b/bgpd/bgp_debug.c
index 8e16186..e3e3ec8 100644
--- a/bgpd/bgp_debug.c
+++ b/bgpd/bgp_debug.c
@@ -194,11 +194,11 @@
 #endif /* HAVE_IPV6 */
 
   if (CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)))
-    snprintf (buf + strlen (buf), size - strlen (buf), ", localpref %d",
+    snprintf (buf + strlen (buf), size - strlen (buf), ", localpref %u",
 	      attr->local_pref);
 
   if (CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC))) 
-    snprintf (buf + strlen (buf), size - strlen (buf), ", metric %d",
+    snprintf (buf + strlen (buf), size - strlen (buf), ", metric %u",
 	      attr->med);
 
   if (CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)))