HADOOP-10278. Refactor to make CallQueue pluggable. (Contributed by Chris Li)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570703 13f79535-47bb-0310-9956-ffa450edef68
YARN-1470. Add audience annotations to MiniYARNCluster. (Anubhav Dhoot via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570708 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10070. RPC client doesn't use per-connection conf to determine server's expected Kerberos principal name. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570776 13f79535-47bb-0310-9956-ffa450edef68
Merge r1569890 through r1570786 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1570787 13f79535-47bb-0310-9956-ffa450edef68