Update to Kafka 1.0.0
Update to Kafka 1.0.0

Update Kafka to 1.0.0-RC4 for testing purposes

Fix filename in checksum

Update to the final Kafka release

Fix checksum comment to mention SHA512 which we use and not MD5

ppatierno/kaas,scholzj/barnabas,scholzj/barnabas,ppatierno/kaas