Implement equals() and hashCode(); for XML and JSON receiver testing.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1593085 13f79535-47bb-0310-9956-ffa450edef68
git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1593087 13f79535-47bb-0310-9956-ffa450edef68