Feature: Configuration Option for Dollar-Topic Publishing

[Z0rdak]

Motivation

I've described the motivation in my previous created issue, but never got an response.

Please let me know if any further changes need to be done.

Resolves #523

Changes

In short: Removed old internal constant to allow clients to publish to dollar topics and replaced it with a XML configuration entry.

Listed changes mostly reflect commits:

• add new boolean configuration for allow-dollar-topics
• add constant for allow-dollar-topic default value
• extend MqttConfigurationService interface with getter and setter for new config option
• add implementation for new interface methods
• add config entity entry to MqttConfigurator
• adapt tests to include new config entity
• remove old internal configuration option constant
• add MqttConfigurationService as argument to PluginAuthorizerService
• adapt PluginAuthorizerService test

[cla-bot]

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[Z0rdak]

Just signed the Contributor License Agreement. My bad. :-)

[cla-bot]

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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 @Z0rdak 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

[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 @Z0rdak 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

[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 @Z0rdak 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