Finish r274315: remove union 'u' from struct pf_send_entry.

Suggested by:	kib
Attempt to report a better error if sanitize is not supported

MFC after:	1 month
Remove unused includes.

Reviewed by:	kib
Enable LRO by default when available on vtnet interfaces

The prior change to not enable LRO by default has confused several
people. The configurations where LRO is problematic is not the
typical use case for VirtIO, and due to other issues, this often
requires checksum offloading to be disabled anyways.

PR:		185864
MFC after:	2 weeks
Make both iSCSI initiator and target support base64 encoded CHAP data.

While all tested initiators and targets use hex-encoded CHAP data, RFC also
allows base64 encoding there, and Microsoft certificaition tool uses it.

Reviewed by:	trasz (earlier version)
MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
We moved to ada a while ago, reflect that in the example.
To allow a request to be submitted from within the callback routine of
a completing one increase the total by 1 but don't advertise it.

Reviewed by:	grehan
Renove faith(4) and faithd(8) from base. It looks like industry
have chosen different (and more traditional) stateless/statuful
NAT64 as translation mechanism. Last non-trivial commits to both
faith(4) and faithd(8) happened more than 12 years ago, so I assume
it is time to drop RFC3142 in FreeBSD.

No objections from:	net@
Handle PREEMPT AND ABORT service action equal to PREEMPT.

With command serialization used in CTL, there are no other commands to abort
when PREEMPT AND ABORT gets to run, so it is practically equal to PREEMPT.

MFC after:	1 week
Use embedded scope zone id to determine outgoing interface for link-local
and node-local addresses.