[autotest] Exit on SIGALARM.

No more SIGALARM chaos, so let's not continue to hide SIGALARM issues.

TEST=pylint
BUG=None

Change-Id: I1d42375c556ecbedb4a16ad6a992eaa8077608fb
Reviewed-on: https://gerrit.chromium.org/gerrit/41136
Tested-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
1 file changed