Fixes <https://bugs.gnu.org/39926>.
Reported by Maxim Cournoyer <maxim.cournoyer@gmail.com>.
Previously we'd error out if the installation script exits with
non-zero, which was the case because the 'reboot' program would
typically not get a reply, and thus would eventually be killed by PID 1
as the system is brought down.
* gnu/tests/install.scm (run-install)[install]: Expect SCRIPT to exit
with SIGTERM in addition to exiting with zero.
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