old docker packages (centos) don't have option -d

docker-update

@@ -42,8 +42,8 @@ for f in $*; do
     for param in $(sed -n '/^ *\([^:]\+\): *$/{s,,'"${name}"'_\1,;h};/^ *image: */{s///;G;s/\n/ /p}' $file); do
 	IFS=" "
 	if [ -z "$limit" ] || [[ "${param}" =~ " ${name}_${limit}" ]]; then
-	    echo "....update $param: docker service update -d --image $param"
+	    echo "....update $param: docker service update --image $param"
-	    docker service update -d --image $param
+	    docker service update --image $param
 	fi
     done
 done