Review Request for D25705 and D25711

[Faraz Vahedi via freebsd-current]

Dear hackers and committers,
I have sent two small patches on freebsd-version(1) and
freebsd-update(8), D25705 and D25711 respectively, to
add -j flag for supporting jails.
I think they are both somewhat ready to either land or
to get some notes for improvements. They have been open
since July 2020, and I know everyone is too busy.
I understand the situation, but I would be very grateful
if anyone could give them a review and help.
I hope you are all doing well. Stay safe.
Yours faithfully,
Faraz

Dear committers,

The aforementioned patches are both tested and ready to either
land or get their final review/suggestions. They are meant to
improve jail management quality by facilitating the retrieving
and upgrading of the userland version of jails. So a user could
simply call freebsd-version(1) or freebsd-update(8) from the
host, along with the -j flag, to specify which jail to retrieve
or upgrade its userland version. So no need to manually set
BASEDIR and UNAME_r anymore, just specify the jail name/id.

I sincerely request a review, please. These small patches are
open since July 2020.

I appreciate your time.

Cheers,
Faraz