[FLINK-23468][test] Do not hide original exception if SSL is not available

[pnowojski]

This is a simple change in tests that throws the original exception instead of failing with JUnit assertion if OpenSSL was not found.

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Documentation

• Does this pull request introduce a new feature? (yes / no)
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Last check on commit 2871b63 (Tue Aug 31 13:45:19 UTC 2021)

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