bmx ping options

src/freedombone-mesh-bmx6

         start
         ;;
     ping)
-        ping $2
+        ping -v -6 $2
         ;;
     data)
         bmx6 -lc traffic=$IFACE

src/freedombone-mesh-bmx7

         start
         ;;
     ping)
-        ping $2
+        ping -v -6 $2
         ;;
     data)
         bmx7 -lc traffic=$IFACE