fwget: remove logging redirects

After adding addpkg() in 10aa369afd9946da18ae51b07aeadc3314fba56d
the redirects are no longer needed. We can now log directly so
simplify the code.

Reported by: manu
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D40077

fwget: improve the pci base script

When matching "class" only match the class byte and not subclass and
programming interface.
Extend the list of supported classes by network, old, and misc (for no
better names on the latter two).
Extend the list of known vendors for various WiFi NICs.
Add a "pci_fixup_class" as some wireless cards have unexpected PCI
classes set. In case we cannot find a matching file for the original
try to see if a "fixed up" version exists. This allows us to avoid
duplicate matching files for the same vendor/driver but different
chipsets.

Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D40072

fwget: Use BSD-2-Clause instead of BSD-2-Clause-FreeBSD

Reported by: bz
Sponsored by: Beckhoff Automation GmbH & Co. KG

fwget: Introduce new utility

This script's goal is to check the system for peripherals that needs
firmware and install the needed packages for them.
For now it only support pci subsystem and only video classes for AMD
and Intel GPUs.

Reviewed by: bapt
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D39825