mtest: Wait for 60 seconds after SIGTERM for test process to exit

When using meson to run integration tests and an integration test times
out, we still want the opportunity to analyze and save the logs from the
integration test so we can figure out why the test got stuck. Currently,
meson only gives test processes half a second to handle SIGTERM before
it sends SIGKILL, which is not sufficient time to analyze all the logs
and do all other cleanup.

Let's bump the timeout after sending SIGTERM to 60s, so that test processes
that wish to do cleanup get some time to do so. This only has an effect if
the test process installs a custom SIGTERM handler. If the test process doesn't
do so, it'll get exited immediately like before.

Author: DaanDeMeyer

mesonbuild/mtest.py

@@ -1394,7 +1394,7 @@ async def _kill(self) -> T.Optional[str]:
                 # Make sure the termination signal actually kills the process
                 # group, otherwise retry with a SIGKILL.
                 with suppress(asyncio.TimeoutError):
-                    await asyncio.wait_for(p.wait(), timeout=0.5)
+                    await asyncio.wait_for(p.wait(), timeout=60)
                 if p.returncode is not None:
                     return None