AVRO-2875: Add logging to avro-tools

[RyanSkraba]

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[busbey]

good: the LICENSE for the avro-tools jar already has a section for slf4j due to our use of slf4j-api and it is generic enough to also cover slf4j-simple.

needs to change: avro-tools embeds a log4j.properties file that defines the logging output. we should remove that file since we're not going to use log4j with this update. if we can make the format match that would be ideal. if it doesn't then we need to release note the difference.

[busbey]

occurred to me: do we need one of the other slf4j bridge jars in order to e.g. get the logging from the hadoop libraries we are including in the tools jar?

[RyanSkraba]

@busbey Good point! It looks like both points can be resolved by restoring the slf4j-log4j12 binding that used to be brought in by Hadoop 2.7.7 (still used by Hadoop 3.x).

With this change both avro-tools-1.9.2.jar and avro-tools-1.11.0-SNAPSHOT.jar will produce the following Hadoop warning:

20/07/23 15:33:43 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

(Missing in 1.10.0)

[RyanSkraba]

@busbey Hello! Can you PTAL? This should restore the pre-1.10.0 behaviour for logging in avro-tools.

[iemejia]

LGTM

[iemejia]

I am merging this because it makes sense and fixes the 'logging regression', in any case don't hesitate to tell if you prefer this done other way @busbey and we will fix it.

[RyanSkraba]

Cherry-picked to branch-1.10.