Sometimes KafkaCdiExtensionTest fails

[jbescos]

#1735

First fix didn't make it work. I am still not able to reproduce it locally, but I did some improvements based on the logs I saw here https://builds.helidon.io/api/DA2B3917F7CA946F13C9B631B711C66C/artifact/13/tests/integration/kafka/target/surefire-reports/io.helidon.messaging.connectors.kafka.KafkaCdiExtensionTest-output.txt

• Tests will make sure they commit messages before they finish.
• Tests will wait till all the messages are published. With this we will know if the problem was producing the message, or consuming it.
• There is one test that is publishing in a topic that doesn't exist. Some internal threads of Kafka write some warn lines again and again. Changing some Kafka properties doesn't help with that, so the test will create the topic at the end to avoid this issue.
• We log more, so next time maybe I will have more relevant information.

2020.05.18 16:48:07 WARNING org.apache.kafka.clients.NetworkClient Thread[kafka-producer-network-thread | producer-23,5,main]: [Producer clientId=producer-23] Error while fetching metadata with correlation id 62 : {unexistingTopic2=UNKNOWN_TOPIC_OR_PARTITION}