MINOR: Add more versions to connect compatibility

[rhauch]

ConnectDistributedTest.test_broker_compatibility hasn't been updated with recent Kafka versions in quite some time.

This can be merged to trunk and easily backported to 2.3, but if backported farther back some versions would have to be removed for each branch. For example, the 2.2 branch should not have a compatibility test for 2.3, and the 2.1 branch should not have a compatibility test for 2.3 or 2.2.

Committer Checklist (excluded from commit message)

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

[rhauch]

See https://jenkins.confluent.io/job/system-test-kafka-branch-builder/2762/ for system test run with just the affected system test method.

[wicknicks]

LGTM. Thanks, @rhauch!

[rhauch]

Actually, this is currently dependent upon #7023, but #7025 is an alternative to #7023. If #7025 is chosen, then this probably needs to be updated to remove the first commit.

[rhauch]

Rebased on trunk since #7023 was merged (and #7025 was not).

@kkonstantine, would you mind reviewing to make sure these combinations are acceptable?

[kkonstantine]

Good to have increased coverage.
LGTM!

[rhauch]

Started another test run of just this parameterized test so we can measure how long it takes to run the tests: https://jenkins.confluent.io/job/system-test-kafka-branch-builder/2817/

[rhauch]

This change results in 22 different test variations for this one method, and the last branch builder run took ~17 minutes to run all 22 tests. That is not a significant increase in time, so IMO this extra validation is worth the minimal cost.

@rajinisivaram or @hachikuji, could one of you review and merge back to the 2.3 branch?

[rhauch]

@rajinisivaram or @hachikuji: ping again for review and merge back to the 2.3 branch.

[cmccabe]

LGTM