HDDS-4794. No appenders could be found for logger - in tests

[adoroszlai]

What changes were proposed in this pull request?

Unit tests in some submodules only output:

log4j:WARN No appenders could be found for logger (org.apache.hadoop.hdds.utils.db.RDBStore).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Adding log4j.properties to fix it.

https://issues.apache.org/jira/browse/HDDS-4794

How was this patch tested?

Checked which tests were affected:
https://github.com/adoroszlai/hadoop-ozone/runs/1834026205#step:4:1

And that no test had the problem with the fix:
https://github.com/adoroszlai/hadoop-ozone/runs/1834329207#step:4:1

[lamberken]

👍 seems that we can remove log4j.threshold=ALL.

ALL includes INFO, and if using following config properties, TRACE, DEBUG logs will not console to stdout.

log4j.rootLogger=INFO,stdout
log4j.threshold=ALL

[swagle]

+1 LGTM

[adoroszlai]

Thanks @lamber-ken and @swagle for the review.