Conditionally create the ZooKeeper lib directory.
Conditionally create the ZooKeeper lib directory.

Also:
 * Update a log message to print the corresponding path and filename.
 * Update the "ZooKeeper" name: zookeeper and Zookeeper -> ZooKeeper
 * Update log messages: "export SUDO=sudo" -> "env SUDO=sudo"

Change-Id: Id8d9480e662d9203a5f0c0a9b52ddc854f3f5536

opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open