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_vty.c b/bgpd/bgp_vty.c
index cbe0b44..bba1c7d 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -8966,7 +8966,7 @@
 	  vty_out (vty, " redistribute %s", zebra_route_string(i));
 
 	  if (bgp->redist_metric_flag[afi][i])
-	    vty_out (vty, " metric %d", bgp->redist_metric[afi][i]);
+	    vty_out (vty, " metric %u", bgp->redist_metric[afi][i]);
 
 	  if (bgp->rmap[afi][i].name)
 	    vty_out (vty, " route-map %s", bgp->rmap[afi][i].name);