Add test demo for LOG4J2-786.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618779 13f79535-47bb-0310-9956-ffa450edef68
Use error level for status in test.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618780 13f79535-47bb-0310-9956-ffa450edef68