Revert "switch to org.apache.kafka.clients.producer.KafkaProducer to see if we can avoid the InterruptedException at the end of the crawl (and log warnings on failure to send message)"

This reverts commit d2f70e5c9767edeadabfbc7424a1eeddc712b2ae.

Conflicts:
	contrib/src/main/java/org/archive/modules/postprocessor/KafkaCrawlLogFeed.java