Sock­ets and nullfs: works now in ‑cur­rent

I just updat­ed to a recent ‑cur­rent and tried the new nullfs. Sock­ets (e.g. the MySQL one) work now with nullfs. No need to have e.g. jails on the same FS and hardlink the sock­et to not need to use TCP in MySQL (or an IP at all for the jail).

Great work!