Remove $FreeBSD$: one-line sh pattern

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

caroot: Update VCS instructions

secure/caroot, certctl: Rename secure/caroot/blacklisted

Old certctl commands still work for compatability, but are deprecated.

Approved by: secteam (gordon)
Differential Revision: https://reviews.freebsd.org/D30807

[1/3] Initial infrastructure for SSL root bundle in base

This setup will add the trusted certificates from the Mozilla NSS bundle
to base.

This commit includes:
- CAROOT option to opt out of installation of certs
- mtree amendments for final destinations
- infrastructure to fetch/update certs, along with instructions

A follow-up commit will add a certctl(8) utility to give the user control
over trust specifics. Another follow-up commit will actually commit the
initial result of updatecerts.

This work was done primarily by allanjude@, with minor contributions by
myself.

No objection from: secteam
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D16856