HDFS-4300. TransferFsImage.downloadEditsToStorage should use a tmp file for destination. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1481996 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4765. Permission check of symlink deletion incorrectly throws UnresolvedLinkException. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1482013 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YARN-474-branch-2-gd