ARROW-6770: [CI][Travis] Download Minio quietly
ARROW-6770: [CI][Travis] Download Minio quietly

Closes #5568 from kszucs/ARROW-6770 and squashes the following commits:

ef4fd495f <Krisztián Szűcs> install minio silently

Authored-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>
Signed-off-by: Krisztián Szűcs <6bab32dc957a05a87930e779f272342e159326fa@gmail.com>

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