HADOOP-9218 Document the Rpc-wrappers used internally (sanjay Radia)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1446428 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4249: rename and reorder phases for clarity
Merge branch 'trunk' into HDFS-4249
HDFS-4249: improve descriptions of phases
HDFS-4249: rewrite JMX metrics piece to dynamically render counters for phases instead of hard-coding to each phase
HDFS-4249: do not display NameNode label (RPC network address) before RPC server has started
HDFS-4249: move startup progress to bottom of DFS health page