Get also mapreduce history service DelegationToken

[jdlesage]

This PR adds DelegationToken for the MapReduce History Server when submitting a new application

My use case
I call skein from a periodic job written in python to archive some files in HDFS using hadoop archive. The goal is to reduce the number of files in HDFS.
I call from a Skein Service the hadoop command hadoop archive that launches a Map Reduce job that creates the archive.
MapReduce jobs do some connections to the MapReduce History Server. It needs a delegation token to authenticate to this service. For this reason, I would like skein also to create a delegation token for this service.

Implementation details
The code is adapted from the hadoop mapreduce project. Unfortunately, I need some functions that are private. That's why I adapted the code in skein.
Original sourcefile: https://github.com/apache/hadoop/blob/branch-2.7.3/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java#L183
If the MapReduce History Server address is not present in the hadoop configuration files. The code does nothing.

How did I test it ?
I tested it by running a skein service that do a subprocess.check_output that triggers the hadoop archive command.

[jdlesage]

The tests are failing because in the hadoop cluster used for test, the MR History Service is configured in mapred.xml but not started with the cluster
I did also a PR in hadoop-test-cluster project to start it also.

[jdlesage]

I added an option to request the new token. I consider it is safer because most of people doesn't care about map reduce history server, and I don't want to change the behavior in this case or break their apps.