Merged from trunk. HDFS-4286. Changes from BOOKKEEPER-203 broken capability of including bookkeeper-server jar in hidden package of BKJM. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608769 13f79535-47bb-0310-9956-ffa450edef68
Merged from trunk. HDFS-4221. Remove the format limitation point from BKJM documentation as HDFS-3810 closed. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608777 13f79535-47bb-0310-9956-ffa450edef68
Mreged from trunk. HDFS-5411. Update Bookkeeper dependency to 4.2.3. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608784 13f79535-47bb-0310-9956-ffa450edef68