Add sensitive() attribute to annotations.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1601536 13f79535-47bb-0310-9956-ffa450edef68
Add support for sensitive attributes to the usual annotations.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1601538 13f79535-47bb-0310-9956-ffa450edef68
Remove unnecessary annotation (SensitivePluginAttribute).

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1601540 13f79535-47bb-0310-9956-ffa450edef68