rc.conf: Add and document the missing root_rw_mount=YES

The 'root_rw_mount' variable was missing, and it caused the rc.d/root
script to always ignore the 'mount -u -o rw /' command. Nevertheless,
t

rc.conf: Add and document the missing root_rw_mount=YES

The 'root_rw_mount' variable was missing, and it caused the rc.d/root
script to always ignore the 'mount -u -o rw /' command. Nevertheless,
the '/' root filesystem was still remounted to be 'rw' because the later
'mount -a' command, according to /etc/fstab.

With this 'root_rw_mount=YES' placed, the '/' entry should now be
optional in /etc/fstab because the '/' root filesystem can be correctly
remounted to be 'rw'.

Obtained-from: FreeBSD (commit 6e1b226)
Reported-by: robstinge (IRC)

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wg: Write rc(8) script to easily manage wg(4) interfaces

This "wg" rc(8) script is somewhat similar to the "wg-quick" tool on
Linux/FreeBSD. It can be used to quickly start/stop the wg(4)
interface

wg: Write rc(8) script to easily manage wg(4) interfaces

This "wg" rc(8) script is somewhat similar to the "wg-quick" tool on
Linux/FreeBSD. It can be used to quickly start/stop the wg(4)
interfaces according to the wg.conf(5) configuration files in the
"/etc/wireguard" directory.

The syntax of wg.conf(5) configuration file is very similar to that
of "wg-quick" but with necessary changes and minor additions. See
wg.conf(5) for details.

On the one hand, the new "wg_enable" and "wg_interfaces" variables in
"/etc/rc.conf" can be used to auto-configure the wg(4) interfaces during
the system startup. See rc.conf(5) for more details.

On the other hand, this "wg" script can be manually called from the
command-line to start/stop the wg(4) interfaces.

Thanks to swildner for reviewing the man page.

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