OAK-1993 - Add command to dump Lucene index in Oak Console

Lucene command (lc [info <idx path>|dump <dest path> <idx path>]) to dump index and info

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1613352 13f79535-47bb-0310-9956-ffa450edef68