[FLINK-17721][filesystems][test] Fix test instability for AbstractHadoopFileSystemITTest.

[xintongsong]

What is the purpose of the change

This PR fixes test instability for AbstractHadoopFileSystemITTest. The problem was that a timeout for checking file status is shared by all test cases and may fail if previous test executions take too long.

Brief change log

Set independent timeout for each file status checking.

Verifying this change

This PR is a fix for existing test cases.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

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Last check on commit dd21b02 (Fri Oct 16 10:54:34 UTC 2020)

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[aljoscha]

The changes look good! But maybe 5 seconds of deadline is not enough?

[xintongsong]

@aljoscha What value do you suggest? Maybe change it back to 30s?

[xintongsong]

I've increased it to 30s.

[aljoscha]

Ok, I think that's good to merge then! I'll merge.

[aljoscha]

Thanks for the PR!