KAFKA-6757 Log runtime exception in case of server startup errors

[eolivelli]

Sometimes while running Kafka server inside tests of an upstream application it can happen that the server cannot start due to a bad runtime error, like a missing jar on the classpath, see KAFKA-6757 for examples .

I would like KafkaServerStartable to log any 'Throwable' in order to catch these unpredictable error

Testing strategy: no test case is needed or it is worth to add

Committer Checklist (excluded from commit message)

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

[eolivelli]

Any interest in this patch ? It is trivial but it saves time

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