Replaced emdedded RedisServer with testcontainers.

[videnkz]

closes #2175

What does this PR do?

Checklist

• This is something else
  • Replaced emdedded RedisServer with testcontainers( embedded redis server uses 2.8.9 version, I used - 6.2.6. From the context of the tests, there should be no difference.)

[apmmachine]

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• Start Time: 2021-11-08T07:14:30.192+0000

• Duration: 68 min 51 sec

• Commit: 19dabd5

Test stats 🧪

Test	Results
Failed	0
Passed	2510
Skipped	19
Total	2529

💚 Flaky test report

Tests succeeded.

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[videnkz]

Hi @cachedout , please check this.
This should solve problem(Unless others suddenly appear :D)

[eyalkoren]

run elasticsearch-ci/docs

[eyalkoren]

@felixbarny do we need to test a specific Redis version?

[felixbarny]

Please rename the tests extending AbstractRedisInstrumentationTest so that they end with IT (integration test). This makes them not run when doing a mvn test, only a mvn verify.

I don't think we need to test against a specific Redis server version.

[videnkz]

Please rename the tests extending AbstractRedisInstrumentationTest so that they end with IT (integration test). This makes them not run when doing a mvn test, only a mvn verify.

I don't think we need to test against a specific Redis server version.

Done

[felixbarny]

/test

[felixbarny]

run elasticsearch-ci/docs