HBASE-10549 When there is a hole, LoadIncrementalHFiles will hang in an infinite loop -- ADDENDUM

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1577776 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10706 Disable writeToWal in tests where possible

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1577780 13f79535-47bb-0310-9956-ffa450edef68