YARN-1781. Modified NodeManagers to allow admins to specify max disk utilization for local disks so as to be able to offline full disks. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1575463 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1575464 13f79535-47bb-0310-9956-ffa450edef68