Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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nfs-over-tls: add user space daemons rpc.tlsclntd and rpc.tlsservd

The kernel changes needed for nfs-over-tls have been committed to main.
However, nfs-over-tls requires user space daemons to handle

nfs-over-tls: add user space daemons rpc.tlsclntd and rpc.tlsservd

The kernel changes needed for nfs-over-tls have been committed to main.
However, nfs-over-tls requires user space daemons to handle the
TLS handshake and other non-application data TLS records.
There is one daemon (rpc.tlsclntd) for the client side and one daemon
(rpc.tlsservd) for the server side, although they share a fair amount
of code found in rpc.tlscommon.c and rpc.tlscommon.h.
They use a KTLS enabled OpenSSL to perform the actual work and, as such,
are only built when MK_OPENSSL_KTLS is set.
Communication with the kernel is done via upcall RPCs done on AF_LOCAL
sockets and the custom system call rpctls_syscall.

Reviewed by: gbe (man pages only), jhb (usr.sbin/Makefile only)
Comments by: jhb
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D28430
Relnotes: yes

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