HADOOP-9848. Create a MiniKDC for use with security testing. (ywskycn via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513308 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5454. TestDFSIO fails intermittently on JDK7 (Karthik Kambatla via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513368 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9848 Addendum fixing OK_JAVADOC_WARNINGS in test-patch

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513527 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9740. Fix FsShell '-text' command to be able to read Avro files stored in HDFS.  Contributed by Allan Yan.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513684 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9446. Support Kerberos SPNEGO for IBM JDK. (Yu Gao via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513687 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5091. Support for spnego keytab separate from the JournalNode keytab for secure HA. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1513700 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk