sdnotify tests: try real hard to kill socat processes

podman gating tests are hanging in the new Fedora CI setup;
long and tedious investigation suggests that 'socat' processes
are being left unkilled, which then causes BATS to hang when
it (presumably) runs a final 'wait' in its end cleanup.

The two principal changes are to exec socat in a subshell
with fd3 closed, and to pkill its child processes before
killing the process itself. I don't know if both are needed.
The pkill definitely is; the exec may just be superstition.
Since I've wasted more than a day of PTO time on this, I'm
okay with a little superstition. What I do know is that with
these two changes, my reproducer fails to reproduce in over
one hour of trying (normally it fails within 5 minutes).

AND, update: only rawhide (f35) leaves stray socat processes
behind. f33 and ubuntu do not, so 'pkill -P' fails.

I really have no idea what's going on.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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