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ARROW-3423: [Packaging] Remove RC information from deb/rpm packages

Because we reuse RC packages as the official release packages when our
vote is passed.

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

Closes #2694 from kou/linux-packages-remove-rc and squashes the following commits:

74b54d0a <Kouhei Sutou>  Remove RC information from deb/rpm packages