Restore CAM_QUIRK_NOLUNS check, lost in previous commit.

MFC after:	1 month
Make autofs timeout handling use timeout task instead of callout;
that's because the handler can sleep on sx lock.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Fix the checksum computation for UDPLite/IPv6. This requires the
usage of a function computing the checksum only over a part of the function.
Therefore introduce in6_cksum_partial() and implement in6_cksum() based
on that.
While there, ensure that the UDPLite packet contains at least enough bytes
to contain the header.

Reviewed by: kevlo
MFC after: 3 days
Call uma_zfree() outside of lock, and improve comment.

Sponsored by:	The FreeBSD Foundation
Make disconnected LUN 0 don't remain in half-configured state if there are
no LUNs on SPC-3 target after we tried REPORT LUNS.
Check for UDP/IPv6 packets that the length in the UDP header is at least
the minimum. Make the check similar to the one for UDPLite/IPv6.

MFC after: 3 days
Use REPORT LUNS command for SPC-2 devices with LUN 0 disconnected.

SPC-2 tells REPORT LUNS shall be supported by devices supporting LUNs other
then LUN 0.  If we see LUN 0 disconnected, guess there may be others, and
so REPORT LUNS shall be supported.

MFC after:	1 month
Add new USB ID.

PR:		194091
MFC after:	3 days
Properly handle a case that should never happen (the bus_dma
callback being called with error set to non-zero).