Fix loop syntax in runPantheonPrivateNetwork.sh (#237)

`while (( "$#" ))` does not work in some shells.

quickstart/runPantheonPrivateNetwork.sh

@@ -14,7 +14,7 @@
 me=`basename "$0"`
 
 PARAMS=""
-while (( "$#" )); do
+while [ $# -gt 0 ]; do
   case "$1" in
     -h|--help)
       echo "Usage:"
@@ -76,4 +76,4 @@ if [ ! ${SKIP_BUILD} ];then
 fi
 docker-compose ${COMPOSE_CONFIG_FILE_OPTION} up -d --scale node=4
 
-${QUICKSTART_FOLDER}/listQuickstartServices.sh
+${QUICKSTART_FOLDER}/listQuickstartServices.sh