[FLINK-15435][python] Fix ExecutionConfigTests.test_equals_and_hash when cpu core number is 6

[libenchao]

Brief change log

Fix ExecutionConfigTests.test_equals_and_hash. It fails when default parallelism is 12.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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Last check on commit df147dd (Sun Dec 29 10:39:44 UTC 2019)

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[hequn8128]

@libenchao Thanks a lot for the fixing. LGTM.
Merging...