First release candidate for 2.0.0-alpha2
HBASE-18511 Default no regions on master

Changes the configuration hbase.balancer.tablesOnMaster from list of
table names to instead be a boolean; true if master carries
tables/regions and false if it does not.

Adds a new configuration hbase.balancer.tablesOnMaster.systemTablesOnly.
If true, hbase.balancer.tablesOnMaster is considered true but only
system tables are put on the master.

M hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
  Master was claiming itself active master though it had stopped. Fix
the activeMaster flag. Set it to false on exit.

M hbase-server/src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java
 Add new configs and convenience methods for getting current state of
settings.

M hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
 Move configs up into super Interface and now the settings mean
different, remove the no longer needed processing.
29 files changed