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ARROW-5619: [C++] Make get_apache_mirror.py workable with Python 3.5

    % python3 --version
    Python 3.5.3
    % python3 cpp/build-support/get_apache_mirror.py
    Traceback (most recent call last):
      File "cpp/build-support/get_apache_mirror.py", line 31, in <module>
        print(json.loads(suggested_mirror)['preferred'])
      File "/usr/lib/python3.5/json/__init__.py", line 312, in loads
        s.__class__.__name__))
    TypeError: the JSON object must be str, not 'bytes'

Debian stretch ships Python 3.5 as python3.

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

Closes #4583 from kou/cpp-apache-mirror-python-3.5 and squashes the following commits:

3d3485815 <Sutou Kouhei>  Make get_apache_mirror.py workable with Python 3.5