Terminate individual tests after 10 minutes

Terminate individual tests after 10 minutes

While using the Automake parallel test harness, if a test hangs for
long enough for an external watchdog to kill the entire build process
(as happens in Debian sbuild after 150 minutes with no activity on
stdout/stderr), the logs will not be shown. If we make an individual
test time out sooner, logs are more likely to be shown.

We use SIGABRT so that the process(es) under test will dump core,
allowing the point at which ostree is blocking to be analyzed.
After 1 minute, if any have not died, we kill them again with SIGKILL.

Signed-off-by: Simon McVittie <smcv@debian.org>
Forwarded: https://github.com/ostreedev/ostree/pull/607

Gbp-Pq: Name Terminate-individual-tests-after-10-minutes.patch