[428] Add overload SimpleAuthOutput.authenticateSuccessfully with boolean parameter to clear auth passwords after authentication

[marregui]

Card: https://hivemq.kanbanize.com/ctrl_board/4/cards/27287/details/
Related card: https://hivemq.kanbanize.com/ctrl_board/4/cards/26231/details/

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[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @marregui on file. In order for us to review and merge your code, please sign our Contributor License Agreement to get yourself added. You'll find the CLA and more information here: https://github.com/hivemq/hivemq-community/blob/master/CONTRIBUTING.adoc#contributor-license-agreement

[sauroter]

@cla-bot check

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