daemon: tests: add a test for missed SIGTERM

This is somewhaht hard to test reliably, but we'll give it a shot. Startup
a sleep(1) daemon with a hefty restart delay. In refactoring of daemon(8),
w

daemon: tests: add a test for missed SIGTERM

This is somewhaht hard to test reliably, but we'll give it a shot. Startup
a sleep(1) daemon with a hefty restart delay. In refactoring of daemon(8),
we inadvertently started dropping SIGTERMs that came in while we were
waiting to restart the child, so we employ the strategy:

- Pop the child sleep(1) first
- Wait for sleep(1) to exit (pid file truncated)
- Pop the daemon(8) with a SIGTERM
- Wait for daemon(8) to exit

The pidfile is specifically truncated outside of the event loop so that we
don't have a kqueue to catch it in the current model.

PR: 277959
Reviewed by: des, markj
Differential Revision: https://reviews.freebsd.org/D47005

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daemon: truncate the pidfile when we're waiting to restart child

We need to be able to test some more restart behavior that depends on
knowing specifically where we're at (inside the event loop or o

daemon: truncate the pidfile when we're waiting to restart child

We need to be able to test some more restart behavior that depends on
knowing specifically where we're at (inside the event loop or outside of
the event loop). Truncate the pidfile until the process is restarted to
give the test a clean marker rather than having to add arbitrary delays
and hoping for the best.

Reviewed by: des, markj
Differential Revision: https://reviews.freebsd.org/D47003

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Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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daemon: add some basic tests

MFC after: 2 weeks
Sponsored by: Axcient
Differential Revision: https://reviews.freebsd.org/D29316