Increase the timeout allowed chromeos-install in servo repair.

The previous timeout of four minutes was borderline for x86-alex,
which could sometimes run over by a little bit.  This change
doubles the timeout to eight minutes.

BUG=chromium:406918
TEST=pylint

Change-Id: I5fad7519588fb7274f246a8551c7e519cade86ba
Reviewed-on: https://chromium-review.googlesource.com/214781
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
1 file changed