Reduced DMF logging level in BaseAmqpService to debug (#868)

Signed-off-by: Alexander Dobler <alexander.dobler3@bosch-si.com>

hawkbit-dmf/hawkbit-dmf-amqp/src/main/java/org/eclipse/hawkbit/amqp/BaseAmqpService.java

@@ -90,7 +90,7 @@ public class BaseAmqpService {
     }
 
     protected static final void logAndThrowMessageError(final Message message, final String error) {
-        LOGGER.warn("Warning! \"{}\" reported by message: {}", error, message);
+        LOGGER.debug("Warning! \"{}\" reported by message: {}", error, message);
         throw new AmqpRejectAndDontRequeueException(error);
     }