KAFKA-8026: Fix flaky regex source integration test 1.0

[bbejeck]

This PR is an attempt to fix the RegexSourceIntegrationTest flakiness. My investigation did not reveal any issues, and I was unable to reproduce the failure locally. So I've taken some steps to eliminate what I think could be a race condition in the test.

This is a mirror image of #6459 and is the fix for 1.0

1. Delete and create all topics before each test starts.
2. Give the streams application in each test a unique application ID
3. Create a KafkaStreams instance local to each test.

Committer Checklist (excluded from commit message)

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

[bbejeck]

ping @guozhangwang @mjsax @vvcephei @ableegoldman

[bbejeck]

Java 7 and Java 8 passed. Java 10 failed.

retest this please

[mjsax]

LGTM.

[mjsax]

Unrelated test failures in Java10. Java7 timed out. Java8 passed.

Retest this please.

[mjsax]

I think Java10 cannot pass on older branches. LGTM.

[bbejeck]

Java 7 and 8 passed, Java 10 failures unrelated.

retest this please.

[bbejeck]

@mjsax I've fixed the ConcurrentModificationException manually, can you take another look?

[bbejeck]

Java 7 passed, Java 8 and 10 failures unrelateed

retest this please

[mjsax]

Still +1 (note, I think that Java10 cannot pass Jenkins on 1.0 branch -- this older branch is not compatible)

Call for second review anyof @guozhangwang @vvcephei @ableegoldman

[bbejeck]

Java 7 passed Java 8 failed 2:21:25 Gradle build daemon disappeared unexpectedly (it may have been killed or may have crashed)

retest this please

[vvcephei]

Thanks, @bbejeck . Just one small thought... Feel free to adopt or ignore it!

[vvcephei]

Could also purge the local state before tests, just in case.