Merged revision(s) 1615491 from hadoop/common/trunk:
HDFS-5723. Append failed FINALIZED replica should not be accepted as valid when that block is underconstruction. Contributed by Vinayakumar B.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1615492 13f79535-47bb-0310-9956-ffa450edef68