Only start zookeeper/memcached when not already running

Since openstack infra already runs these services (or will)
we should just use them when we can. Also for developers that
already have these services running we should use them when
we can instead of trying to recreate them.

Change-Id: I8655e5365ad36c57836f87e147102e2d02db7830

setup-test-env.sh

@@ -5,16 +5,20 @@ ZOO_CONF=/etc/zookeeper
 ZOO_DIR=/usr/share/zookeeper
 ZOO_BIN=$ZOO_DIR/bin
 ZOO_TMP_DIR=$(mktemp -d /tmp/ZOO-TMP-XXXXX)
+ZOOKEEPER_STARTED=0
 
 mkdir $ZOO_TMP_DIR/bin
 
 function clean_exit(){
     local error_code="$?"
-    if [ -d $ZOO_CONF ]; then
+    if [ -d $ZOO_CONF ] && [ $ZOOKEEPER_STARTED -eq 1 ]; then
         stop_zookeeper_server
     fi
     rm -rf ${ZOO_TMP_DIR}
-    kill $(jobs -p)
+    local spawned=$(jobs -p)
+    if [ -n "$spawned" ]; then
+        kill $(jobs -p)
+    fi
     return $error_code
 }
 
@@ -38,18 +42,27 @@ function start_zookeeper_server(){
 }
 
 
-function stop_zookeeper_server(){
+function check_port(){
+    netstat -an 2>/dev/null | grep -q "$1"
+    return $?
+}
 
+function stop_zookeeper_server(){
     $ZOO_TMP_DIR/bin/zkServer.sh stop
 }
 
 trap "clean_exit" EXIT
 
-if [ -d $ZOO_CONF ]; then
+if ! check_port 2181 && [ -d $ZOO_CONF ]; then
     start_zookeeper_server
+    if [ $? -eq 0 ]; then
+        ZOOKEEPER_STARTED=1
+    fi
 fi
 
-memcached &
+if ! check_port 11211; then
+    memcached &
+fi
 
 # Yield execution to venv command
 $*