HADOOP-9203. RPCCallBenchmark should find a random available port. Contributec by Andrew Purtell.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433220 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4938. Use token request messages defined in hadoop common. Contributed by Suresh Srinvias.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433227 13f79535-47bb-0310-9956-ffa450edef68
YARN-328. Use token request messages defined in hadoop common. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433231 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4375. Use token request messages defined in hadoop common. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1433235 13f79535-47bb-0310-9956-ffa450edef68