ZOOKEEPER-1552. Enable sync request processor in Observer (thawan, fpj)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1527760 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-1758. Add documentation for zookeeper.observer.syncEnabled flag (thawan, fpj via thawan)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1527775 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-1769. ZooInspector can't display node data/metadata/ACLs (Benjamin Jaton via phunt)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1527908 13f79535-47bb-0310-9956-ffa450edef68