Use correct LoggerContext

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1604079 13f79535-47bb-0310-9956-ffa450edef68
Add missing license headers

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1604081 13f79535-47bb-0310-9956-ffa450edef68
Add license header

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1604082 13f79535-47bb-0310-9956-ffa450edef68