Remove $FreeBSD$: one-line sh pattern

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

Update/fix Makefile.depend for userland

Enable veriexec for loader

This relies on libbearssl and libsecureboot
to verify files read by loader in a maner equivalent
to how mac_veriexec

Note: disabled by default.
Use is initially expected to be by embeded vendors

Reviewed by: emaste, imp
Sponsored by: Juniper Networks
Differential Revision: D16336

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix