This prevents git_pillar certificate errors. Additionally, sometimes
/dev/rtc becomes unresponsive which leads the ``hwclock --compare``
command to spin indefinitely, ultimately causing the entire test run to
fail. This changeset uses a SIGALRM handler to abort the hwclock command
if no output is seen within 3 seconds and try a second time. If it times
out the second time as well, then an error will be logged but it will
not be fatal to the test (or hang it indefinitely).
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