Fix connections check in teardown script

conns may return the following error:

    This ZooKeeper instance is not currently serving requests

docker/bin/zookeeperTeardown.sh

@@ -18,10 +18,10 @@ DATA_DIR=/data
 MYID_FILE=$DATA_DIR/myid
 LOG4J_CONF=/conf/log4j-quiet.properties
 
-# Wait for client connections to drain. Kubernetes will wait until the confiugred
+# Wait for client connections to drain. Kubernetes will wait until the configured
 # "terminationGracePeriodSeconds" before focibly killing the container
 for (( i = 0; i < 6; i++ )); do
-  CONN_COUNT=`echo cons | socat stdio tcp:localhost:$CLIENT_PORT | grep -v "^$" |grep -v "/127.0.0.1:" | wc -l`
+  CONN_COUNT=`echo cons | socat stdio tcp:localhost:$CLIENT_PORT | grep -v "^$" |grep -v -e "/127.0.0.1:" -e "This ZooKeeper instance is not currently serving requests" | wc -l`
   if [[ "$CONN_COUNT" -gt 0 ]]; then
     echo "$CONN_COUNT non-local connections still connected."
     sleep 5