MAPREDUCE-3685. Fix bugs in MergeManager to ensure compression codec is appropriately used and that on-disk segments are correctly sorted on file-size. Contributed by Anty Rao and Ravi Prakash.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1453365 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd