Remove $FreeBSD$: one-line sh pattern

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

devfs.rules: Do not expose "log" in the default devfs rules.

/etc/rc.d/jail no longer creates /dev/log as a symbolic link since
commit 84b354cb9ab61224713c159b1484e8f070fd37be.

PR: 228351
Reviewed by: jamie, mark
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D34563

devfs.rules: Correctly unhide pf in vnet jails

Revision 9e9be081d8 introduced a new devfs rule devfsrules_jail_vnet. It
includes rule devfsrules_jail which include other rules. Unfortunately
devfs could not recursively parse the action include and thus
devfsrules_jail_vnet will expose all nodes.

PR: 255660
Reviewed by: kp
Obtained from: Gijs Peskens <gijs@peskens.net>
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D32814

devfs.rules: unhide pf in vnet jails

/dev/pf is usable in vnet jails, so don't hide the node there.

We shouldn't expose /dev/pf in regular jails, as that gives them control over
the host (or parent vnet jail) firewall.

Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D26537

Move all devfs related files to sbin/devfs/

This is related to pkgbase as it uses CONFS to properly tag these as config
files.

Approved by: will (mentor)
Differential Revision: https://reviews.freebsd.org/D16785