board/common: show: Add show stp

board/common/rootfs/usr/bin/show

@@ -76,6 +76,7 @@ commands:
   ifaces        Show interfaces and their addresses
   fdb           Show forwarding database (unicast)
   mdb           Show multicast forwarding database
+  stp           Show spanning tree status
   ip   addr     Show IPv4 addresses
        route    Show routing table
   ipv6 addr     Show IPv6 addresses
@@ -188,6 +189,12 @@ rstp()
     mstpctl showport br0
 }
 
+stp()
+{
+    sysrepocfg -f json -X -d operational -m ietf-interfaces | \
+        /usr/libexec/statd/cli-pretty "show-bridge-stp"
+}
+
 fdb()
 {
     bridge $bopt fdb show
@@ -353,6 +360,9 @@ case $cmd in
     span*)
 	rstp
 	;;
+    stp*)
+	stp
+	;;
     sys*)
 	system
 	;;