add port command

bin/jenkins/test-redis

@@ -52,7 +52,7 @@ function stop_redis() {
 }
 
 if [[ -z ${1} ]] ; then
-  die "expected start or stop"
+  die "expected one of: start stop port"
 fi
 
 case ${1} in
@@ -62,6 +62,9 @@ case ${1} in
   "stop")
     stop_redis
     ;;
+  "port")
+    redis_port
+    ;;
   *)
     die "invalid argument: ${1}"
     ;;