HBASE-9651 Backport HBASE-3890 'Scheduled tasks in distributed log splitting not in sync with ZK' to 0.94



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1526194 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9649 HFilePrettyPrinter should not throw a NPE if FirstKey or LastKey is null (Jean-Marc Spaggiari)


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1526353 13f79535-47bb-0310-9956-ffa450edef68