YARN-1964. Create Docker analog of the LinuxContainerExecutor in YARN
HADOOP-9576. Changed NetUtils#wrapException to throw EOFException instead of wrapping it as IOException. Contributed by Steve Loughran

Conflicts:
	hadoop-common-project/hadoop-common/CHANGES.txt
HADOOP-9576. Merging to branch-2.6 for hadoop-2.6.0-rc1.