HDFS-7210. Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append call from DFSClient. (Vinayakumar B via umamahesh)
(cherry picked from commit 1556f86a31a54733d6550363aa0e027acca7823b)
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2