docs: KUDU-2411: Document the binary test jar
docs: KUDU-2411: Document the binary test jar

This patch adds documentation for how to use the Kudu binary test jar.

Change-Id: I8189f1703626587a5313d8c1fb11d046455d9f39
Reviewed-on: http://gerrit.cloudera.org:8080/12685
Tested-by: Kudu Jenkins
Reviewed-by: Grant Henke <4cf7ebbe638391c4d27a10cf751b99bdbd1a1880@apache.org>

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