org.nuxeo.launcher.config.ConfigurationGenerator.getLogFiles() must return all configured appenders

The method org.nuxeo.launcher.config.ConfigurationGenerator.getLogFiles() currently only returns Log4J appenders attached to the root logger: i.e. CONSOLE (console.log) for the Launcher and SERVER (server.log) for the Nuxeo server.
There are a few other useful appenders (errors raised to the end user, errors sent to STDERR...) as well as sample appenders the administrator can reuse (automation.log, storage.log...).
The should return all configured appenders: ERROR-FILE (nuxeo-error.log), STDERR-FILE (stderr.log)...

Also, in org.nuxeo.launcher.gui.NuxeoFrame.buildLogsTab(), add the nuxeoctl.log file which is not managed by Log4J but directly created by the nuxeoctl Shell script.