Move Flume Appender to logging-log4j-flume repo

[ppkarwasz]

The code of the Flume Appender has been moved to a new logging-log4j-flume.

This PR remove the log4j-flume-ng module from the repository and cleans up the dependency management section.

[vy]

I presume you did not update src/site due to the missing logging-log4j-flume website, right?

[ppkarwasz]

I presume you did not update src/site due to the missing logging-log4j-flume website, right?

I think that the Flume Appender should be documented in the main site.
We can create a stub /log4j/flume/2.x site later that only refers the user to the main site.

[vy]

I presume you did not update src/site due to the missing logging-log4j-flume website, right?

I think that the Flume Appender should be documented in the main site. We can create a stub /log4j/flume/2.x site later that only refers the user to the main site.

I prefer placing the docs next to the sources. This worked nicely for JMX GUI and Jakarta. Why do you think we need to create an exception for Flume?

[ppkarwasz]

I prefer placing the docs next to the sources. This worked nicely for JMX GUI and Jakarta. Why do you think we need to create an exception for Flume?

There must be some integration, so that users can find the appender.

Maybe we can move the Flume Appender documentation to its own website and replace the current description in appenders.adoc with a stub. I would prefer to do it, when the /log4j/flume website is ready though. What do you think?

[vy]

There must be some integration, so that users can find the appender.

Maybe we can move the Flume Appender documentation to its own website and replace the current description in appenders.adoc with a stub. I would prefer to do it, when the /log4j/flume website is ready though. What do you think?

When /log4j/flume is up, we can place pointers to nav.adoc, appenders.adoc, etc. for Flume-related stuff. But I am not keen on sharing Flume-related technical details in /log4j/2.x, IMO, they should be situated in /log4j/flume instead.