Set the release date for 2.5.2
HADOOP-11296. Nfs3FileAttributes should not change the values of rdev, nlink and size in the constructor. Contributed by Brandon Li.
HADOOP-9576. Changed NetUtils#wrapException to throw EOFException instead of wrapping it as IOException. Contributed by Steve Loughran
YARN-2841. RMProxy should retry EOFException.  Contributed by Jian He
YARN-2841: Correct fix version from branch-2.6 to branch-2.7 in the
change log.