The kernel changes required for nfs-over-tls have been
committed to head for some time.
However, the userspace daemons could not be committed,
since they require an OpenSSL with KTLS support.
Since openssl patches that add KTLS support have now
been committed to head/main (thanks jhb@), these
daemons can now be committed.
I realize this is a lot to review, but if someone could
at least look at the Makefile change for usr.sbin/Makefile,
that would be appreciated.
I would like to commit this soon in hopes that they
can be MFC'd to stable/13 and make it in FreeBSD13.