Javadoc update.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1586088 13f79535-47bb-0310-9956-ffa450edef68
Extract method.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1586089 13f79535-47bb-0310-9956-ffa450edef68
Remove LoggerStream and LoggerWriter.

  - See LOG4J2-547.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1586091 13f79535-47bb-0310-9956-ffa450edef68