After r331668 handling of F_NOT flag done in one place by
print_instruction() function. Also remove unused argument from
print_ip[6]() functions.
MFC after: 1 week
After consultation with SPDX experts and their matching guidelines[1],
the licensing doesn't exactly match the BSD-2-Clause. It yet remains to be
determined if they are equivalent or if there is a recognized license that
matches but it is safer to just revert the tags.
Let this also be a reminder that on FreeBSD, SPDX tags are only advisory
and have no legal value (but IANAL).
Pointyhat to: pfg
Thanks to: Rodney Grimes, Gary O'Neall
[1] https://spdx.org/spdx-license-list/matching-guidelines
Usual moving of code with no changes from ipfw2.c to the
newly created files, and addition of prototypes to ipfw2.h
I have added forward declarations for ipfw_insn_* in ipfw2.h
to avoid a global dependency on ip_fw.h
