MAPREDUCE-5083. MiniMRCluster should use a random component when creating an actual cluster. Contributed by Siddharth Seth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1459932 13f79535-47bb-0310-9956-ffa450edef68
YARN-470. Support a way to disable resource monitoring on the NodeManager. Contributed by Siddharth Seth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1460001 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into MAPREDUCE-4987
MAPREDUCE-4987: correct typo in comment