[HBASE-2692] Master rewrite and cleanup for 0.90 - ASF JIRA

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This is the parent issue for master changes targeted at 0.90 release.

Changes done as part of this issue grew out of work done over in ~~HBASE-2485~~ to move region transitions into ZK.

In addition to that work, this issue will include general HMaster and ZooKeeper refactorings and cleanups.

breaks

HBASE-14079 improve error message when Master fails to connect to Hadoop-auth

incorporates

HBASE-1851 Broken master failover

HBASE-2485 Persist Master in-memory state so on restart or failover, new instance can pick up where the old left off

is depended upon by

HBASE-2896 Retain assignment information between cluster shutdown/startup

is related to

HBASE-2701 Move user-triggered region admin methods (compact/split/flush) to go directly to RS

1.	Move RS to Master region open/close messaging into ZooKeeper	Closed	Karthik Ranganathan
2.	HMaster cleanup and refactor	Closed	Jonathan Gray
3.	ZooKeeper cleanup and refactor	Closed	Jonathan Gray
4.	Implement new open/close logic in handlers and stop using heartbeats for open/close messages	Closed	Jonathan Gray
5.	Reimplement cluster startup to use new load balancer	Closed	Jonathan Gray
6.	Reimplement load balancing to be a background process and to not use heartbeats	Closed	Jonathan Gray
7.	Handle master failover for regions in transition	Closed	Jonathan Gray
8.	Move user-triggered region admin methods (compact/split/flush) to go directly to RS	Closed	Jonathan Gray