Remove unused dependencies.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1592405 13f79535-47bb-0310-9956-ffa450edef68
Organize dependencies.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1592406 13f79535-47bb-0310-9956-ffa450edef68