HDFS-7179. DFSClient should instantiate a KeyProvider, not a KeyProviderCryptoExtension. (wang)
HDFS-7181. Remove incorrect precondition check on key length in FileEncryptionInfo. (wang)
HADOOP-11160. Fix typo in nfs3 server duplicate entry reporting. Contributed by Charles Lamb.
YARN-2527. Fixed the potential NPE in ApplicationACLsManager and added test cases for it. Contributed by Benoy Antony.
YARN-2628. Capacity scheduler with DominantResourceCalculator carries out reservation even though slots are free. Contributed by Varun Vasudev
HADOOP-11151. Automatically refresh auth token and retry on auth failure. Contributed by Arun Suresh.
YARN-1964 Launching containers from docker

This adds a new ContainerExecutor called DockerContainerExecutor.
This executor launches a container in a docker container, providing
a full filesystem namespace and software isolation for the container.