YARN-1964. Create Docker analog of the LinuxContainerExecutor in YARN
YARN-2780. Log aggregated resource allocation in rm-appsummary.log. Contributed by Eric Payne
YARN-2236. [YARN-1492] Shared Cache uploader service on the Node Manager. (Chris Trezzo and Sanjin Lee via kasha)
HADOOP-9576. Merging to branch-2.6 for hadoop-2.6.0-rc1.
YARN-2841. Merging to branch-2.6 for hadoop-2.6.0-rc1.
YARN-2843. Merging to branch-2.6 for hadoop-2.6.0-rc1.
YARN-2794. Fixed log messages about distributing system-credentials. Contributed by Jian He.