daemonize / daemon_with_notify: ignore Ubuntu 13.10 brain death.

Apparently init --user adopts orphans.  To quote the author
Stewart Smith:

  As much as one can be happy in Ubuntu breaking something that has been
  true for what must be approaching 40 years, yep, I'm happy for you to
  make the changes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
io: fix port clash in test.

Both run-set_alloc and run-15-timeout used the same port, so they sometimes
got stuck when running in parallel.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>