arrow

ARROW-3111: [Java] Adding logback config file to allow running tests with different log level

Java uses the logback logger when running test, which has a default level of DEBUG. To change the level, an XML config file is needed. This adds a config file with level of ERROR. This config file is not used automatically and it's location needs to be specified. One way to specify this via command line is: `mvn -Dlogback.configurationFile=file:${ARROW_HOME}/java/dev/logback.xml`.

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #2465 from BryanCutler/java-adding-logback-config-ARROW-3111 and squashes the following commits:

04223d35 <Bryan Cutler> fixed Logback case
d53802e7 <Bryan Cutler> added readme instructions
e20fbb11 <Bryan Cutler> forgot test in example cmd
c06c37a1 <Bryan Cutler> Adding logback config file