Adding kafka properties to KafkaProtobufDeserializer.

[StephanePaulus]

Adding kafka properties to KafkaProtobufDeserializer, to be able to execute schema registry rules.

In class: AbstractKafkaSchemaSerDe, method protected Object executeRules, line 671

      RuleContext ctx = new RuleContext(config.originals(), source, target,
          subject, topic, headers,
          isKey ? original : key(),
          isKey ? null : original,
          isKey, ruleMode, rule, i, rules);

config.originals() will throw a null pointer exception and fail the deserialization.

Not sure if my fix is the best way, I guess maybe a method that takes all the kafka properties from both kafka and the schema registry including the URL and username/password with the default key that are defined in the connection configuration?