Updated Docker build files so they are working again

[klauerm]

We are using the benchmark tests for testing K8s Kafka clusters within our SAP landscapes. In the docker folder there where build files, that where not working for us. Therefore, I've adapted them to our needs but I think the changes are company independent. So sapmachine is an open source Java distribution and a good replacement for the outdated openjdk.

Please consider merging this PR.

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