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ARROW-5047: [Release] Always set up parquet-testing in verification script

It's also used by Rust.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #4062 from kou/release-always-setup-parquet-test and squashes the following commits:

8f9a233e <Kouhei Sutou>  Always set up parquet-testing in verification script