Moving MAPREDUCE-4678's changes line to 0.23 section to prepare for backport.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433409 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4925. The pentomino option parser may be buggy. Contributed by Karthik Kambatla. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433414 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4936. JobImpl uber checks for cpu are wrong. Contributed by Arun C Murthy


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433445 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4399. Fix RAT warnings by excluding images sub-dir in docs. Contributed by Thomas Graves.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433461 13f79535-47bb-0310-9956-ffa450edef68
YARN-335. Fair scheduler doesn't check whether rack needs containers before assigning to node. Contributed by Sandy Ryza.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433484 13f79535-47bb-0310-9956-ffa450edef68
YARN-336. Fair scheduler FIFO scheduling within a queue only allows 1 app at a time. Contributed by Sandy Ryza.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433526 13f79535-47bb-0310-9956-ffa450edef68