ipfilter: Set ipf -T optionlist at boot

There is no easy way to set ipfilter optionlist variables during boot.
Add plumbing to the rc script to support this.

PR: 130555
Reviewed by: jlduran
Differential Revision: https://reviews.freebsd.org/D47346

(cherry picked from commit 8d6feaaaa26f444abb209360e52b993e39cb81bb)