Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r233110:
Use new -n option when executing kldload, to
not warn about already loaded module(s).

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

- Need to respect the module name and the USB mode when accumulating device ID's.
- Be more verbose on file seek failures. Allow a file size of zero.
- Improve the wrapper shell.

MFC after: 14 days

- Improve bus_autoconf tool.
- Implement simple and generic language which can
be used to describe any kind of device ID structures.
- Fix endian issues.
- Add an example format file.

Suggested by: imp @
MFC after: 14 days

- We need to sort all USB device ID's together. Else the matching order will
be wrong. This is required because devd only executes one entry.

MFC after: 14 days

- Make sure we don't match the wrong device by adding
a match for the bus the device belongs to.

PR: misc/157903
MFC after: 14 days

- Add additional information to the PnP info of USB HUBs children which
is now required by bus_autoconf.
- Allow interface class matching even if device class is vendor specific.
- Update bus_autoconf tool to not generate system and subsystem match lines
for the nomatch event.

PR: misc/157903
MFC after: 14 days

- Move all USB device ID arrays into so-called sections,
sorted according to the mode which they support:
host, device or dual mode
- Add generic tool to extract these data:
tools/bus_autoconf

Discussed with: imp
Suggested by: Robert Millan <rmh@debian.org>
PR: misc/157903
MFC after: 14 days