MAPREDUCE-5113. Streaming input/output types are ignored with java mapper/reducer. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1466870 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5098. Fix findbugs warnings in gridmix. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1466872 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9315-branch-2-gd