ThreadContext.clearAll() must be used from tests to avoid creating test failures due to test ordering.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1593350 13f79535-47bb-0310-9956-ffa450edef68
ThreadContext.clearAll() must be used from tests to avoid creating test failures due to test ordering.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1593351 13f79535-47bb-0310-9956-ffa450edef68
ThreadContext.clearAll() must be used from tests to avoid creating test failures due to test ordering.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1593352 13f79535-47bb-0310-9956-ffa450edef68