Deprecate `log4j2.defaultStatusLevel` property
The Log4j system property `log4j2.defaultStatusLevel` has almost the
same purpose as the `log4j2.statusLoggerLevel`:
* the `log4j2.statusLoggerLevel` property sets the level of the fallback
status logger listener **before** a configuration is parsed,
* the `log4j2.defaultStatusLevel` property sets the level of the
fallback status logger listener **after** a configuration is parsed
(unless the configuration has a `status` attribute).
Removing one of them makes `-Dlog4j2.statusLoggerLevel=WARN` a viable
less verbose alternative to `-Dlog4j2.debug`.
5 files changed
