ZOOKEEPER-1830. Support command line shell for removing watches (Rakesh R via michim)


git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1584454 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-1831. Document remove watches details to the guide (Rakesh R via michim)


git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1584459 13f79535-47bb-0310-9956-ffa450edef68