HADOOP-11091. Eliminate old configuration parameter names from s3a (dsw via cmccabe)
HADOOP-10868. AuthenticationFilter should support externalizing the secret for signing and provide rotation support. (rkanter via tucu)
HADOOP-10868. Addendum
HDFS-6965. NN continues to issue block locations for DNs with full
disks. Contributed by Rushabh Shah.
YARN-2531. Added a configuration for admins to be able to override app-configs and enforce/not-enforce strict control of per-container cpu usage. Contributed by Varun Vasudev.
YARN-2557. Add a parameter "attempt_Failures_Validity_Interval" into
DistributedShell. Contributed by Xuan Gong
HDFS-6880. Adding tracing to DataNode data transfer protocol (iwasakims via cmccabe)
HADOOP-11055. non-daemon pid files are missing (aw)
Merge branch 'trunk' into HDFS-6581

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/Receiver.java