[REEF-1727] Add the AM token to the client app credentials in the Unmanaged AM mode

Summary of changes:
   * For Unmanaged AM mode, add YARN security token to teh app credentials so that (in-process) AM can use it.
   * Bugfix: `YarnSubmissionHelper` must implement `AutoCloseable`, not `java.io.Closeable`.
   * `.close()` method does not throw.
   * Minor logging improvements.

JIRA: [REEF-1727](https://issues.apache.org/jira/browse/REEF-1727)

This closes  #1242
1 file changed
tree: c6153555ef72391d60bda050706486205633fbed
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README.md

Apache REEF™

Apache REEF™ (Retainable Evaluator Execution Framework) is a library for developing portable applications for cluster resource managers such as Apache Hadoop YARN or Apache Mesos. For example, Microsoft Azure Stream Analytics is built on REEF and Hadoop.

Online Documentation

Detailed information on REEF can be found in the following places:

The developer mailing list is the best way to reach REEF‘s developers when the above aren’t sufficient.

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REEF JavaUbuntuBuild Status
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Java.NET
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Apache 2.0