Consistently use "LOGGER" for the StatusLogger when used as a static final.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1516472 13f79535-47bb-0310-9956-ffa450edef68
Consistently use "LOGGER" for the StatusLogger when used as a static final.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1516473 13f79535-47bb-0310-9956-ffa450edef68