HBASE-10401 [hbck] perform overlap group merges in parallel


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1560774 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10409 Allow config options related to zookeeper to be passed to IntegrationTestsDriver (Ted Yu)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1560804 13f79535-47bb-0310-9956-ffa450edef68