MINOR: Pass KafkaVersion to nodes in KafkaService. Related to PR#7000

[rhauch]

PR #7000 added a KafkaVersion.support_named_listeners() method and used this in tests/kafkatest/services/kafka/templates/kafka.properties. However, if KafkaService expects the version parameter to be a string (as denoted in the doc), then KafkaService needs to construct a KafkaVersion and pass it to the nodes rather than passing the string, since the string does not have the support_named_listeners() method.

This could be an alternative to #7023.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[rhauch]

System tests build with this change: https://jenkins.confluent.io/job/system-test-kafka-branch-builder/2765/

[rajinisivaram]

@rhauch Thanks for the PR, the doc for KafkaService wrongly describes version as String. All callers except the failing connect tests pass in KafkaVersion rather than a String. So I think we should update these instead:

kafka/tests/kafkatest/tests/connect/connect_distributed_test.py

Line 530 in da07985

@parametrize(broker_version=str(DEV_BRANCH), auto_create_topics=False, security_protocol=SecurityConfig.PLAINTEXT, connect_protocol='compatible')

. Left a note to this effect in #7023.

[rhauch]

Thanks, Rajini. Closing without merging.