[FLINK-16136][yarn][tests] Increase disk space limit for all YARN tests

[rmetzger]

What is the purpose of the change

• Increase test stability by requiring less free disk space (the azure agents have large disks, but little free space (proportionally))

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This change is already covered by existing tests.

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This code only affects the testing infrastructure.

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• If yes, how is the feature documented? (not applicable)

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Last check on commit efc7354 (Tue Feb 18 12:39:16 UTC 2020)

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[wangyang0918]

I think it really makes sense to set the NM_MAX_PER_DISK_UTILIZATION_PERCENTAGE to 99%
in YarnMiniCluster for tests. Since it will avoid some unstable yarn tests in low disk capacity environment.

[rmetzger]

Thanks a lot for your review. Merging the PR.