[Log4j] log4j-server

[Mikael Ståldal]

The SocketServer stuff is now in the new log4j-server module, which is 
in the new log4j-tools repo.

Is anyone going to release this new repo in conjuntion with the 2.9 
release of the main repo? If not, the SocketServer stuff will be gone.

If we want to have a binary release of the SocketServer stuff we need to 
either release the new repo, or move the log4j-server module to the main 
repo before the 2.9 release.