HBASE-10169 Batch coprocessor (Jingcheng Du and Gary Helmling)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1576791 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10726 Fix java.lang.ArrayIndexOutOfBoundsException in StochasticLoadBalancer (Enis Soztutar)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1576795 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10688 Add a draining_node script to manage nodes in draining mode

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1576856 13f79535-47bb-0310-9956-ffa450edef68