Checkstyle missing unused imports?

Should the check style verification report unused imports? It seems it [missed a few](https://github.com/apache/camel-kafka-connector/blob/fb7a3673a6cf2a107cbebbf9cb6ac24408a2b04f/tests/src/test/java/org/apache/camel/kafkaconnector/ConnectorPropertyFactory.java#L21) of those on my [last PR](https://github.com/apache/camel-kafka-connector/pull/155) . So ... reporting this as a possible bug. 