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ARROW-4344: [Java] Further cleanup mvn output, upgrade rat plugin

Further cleanup of mvn output to help reduce CI log clutter. Changed EchoServer used in tests to have log level of debug. Upgraded rat license check plugin to 0.13. The previous version made lots of output just showing what file types were being excluded. The upgraded version omits this, but it can be enabled by setting --debug.

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #3466 from BryanCutler/java-further-mvn-cleanup-ARROW-4344 and squashes the following commits:

65e0dce <Bryan Cutler> Change EchoServer logging level to debug for tests
b58cd03 <Bryan Cutler> Upgrade Java rat plugin to 0.13