HBASE-9020 Make hbase-it HBASE_HOME configurable

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1506206 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9008 Reenable TestReplicationKillSlaveRS.killOneSlaveRS

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1506246 13f79535-47bb-0310-9956-ffa450edef68
hbase-9002: TestDistributedLogSplitting.testRecoveredEdits fails

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1506275 13f79535-47bb-0310-9956-ffa450edef68