HBASE-8396 balancerSwitch making two zookeeper calls everytime(Rajeshbabu)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1471460 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8327 Consolidate class loaders

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1471464 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd