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ARROW-3948: [GLib][CI] Set timeout to Homebrew

We can't get Homebrew log when Travis detects hanged Homebrew process and kill the CI job.
We need to detect hanged Homebrew process and kill the Homebrew process to get Homebrew log.

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

Closes #3115 from kou/glib-ci-timeout-homebrew and squashes the following commits:

fe23b049 <Kouhei Sutou>  Set timeout to Homebrew