HBASE-9709: LogReplay throws NPE when no KVs to be replayed in a WALEdit

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1529247 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9687 ClassNotFoundException is thrown when ExportSnapshot runs against hadoop cluster where HBase is not installed on the same node as resourcemanager



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1529288 13f79535-47bb-0310-9956-ffa450edef68