Pull up following revision(s) (requested by rmind in ticket #354):
	sys/net/npf/npf_state_tcp.c: revision 1.4
	sys/net/npf/npf_state_tcp.c: revision 1.5
	sys/net/npf/npf_state_tcp.c: revision 1.6
	usr.sbin/npf/npftest/npftest.c: revision 1.1
	usr.sbin/npf/npftest/libnpftest/npf_mbuf_subr.c: revision 1.1
	usr.sbin/npf/npftest/npftest.c: revision 1.2
	usr.sbin/npf/npftest/libnpftest/npf_mbuf_subr.c: revision 1.2
	usr.sbin/npf/npfctl/npf_data.c: revision 1.11
	usr.sbin/npf/npftest/npftest.c: revision 1.3
	usr.sbin/npf/npfctl/npf_data.c: revision 1.12
	usr.sbin/npf/npftest/npftest.h: revision 1.1
	usr.sbin/npf/npfctl/npf_parse.y: revision 1.5
	usr.sbin/npf/npfctl/npf_data.c: revision 1.13
	sys/net/npf/npf.h: revision 1.16
	usr.sbin/npf/npftest/npftest.h: revision 1.2
	usr.sbin/npf/npfctl/npf_parse.y: revision 1.6
	usr.sbin/npf/npftest/npftest.h: revision 1.3
	usr.sbin/npf/npfctl/npf_parse.y: revision 1.7
	usr.sbin/npf/npfctl/npf_ncgen.c: revision 1.10
	usr.sbin/npf/npfctl/npf_build.c: revision 1.6
	usr.sbin/npf/npfctl/npf_parse.y: revision 1.8
	usr.sbin/npf/npfctl/npf_build.c: revision 1.7
	usr.sbin/npf/npftest/libnpftest/npf_state_test.c: revision 1.1
	usr.sbin/npf/npftest/libnpftest/npf_nbuf_test.c: revision 1.1
	usr.sbin/npf/npfctl/npf_build.c: revision 1.8
	usr.sbin/npf/npftest/libnpftest/npf_table_test.c: revision 1.1
	usr.sbin/npf/npfctl/npf_build.c: revision 1.9
	usr.sbin/npf/npfctl/npf.conf.5: revision 1.10
	usr.sbin/npf/npfctl/npf.conf.5: revision 1.11
	usr.sbin/npf/npfctl/npf.conf.5: revision 1.12
	sys/net/npf/npf_state.c: revision 1.7
	usr.sbin/npf/npfctl/npfctl.c: revision 1.11
	usr.sbin/npf/npfctl/npfctl.c: revision 1.12
	usr.sbin/npf/npfctl/Makefile: revision 1.7
	sys/rump/net/lib/libnet/Makefile: revision 1.14
	sys/net/npf/npf_mbuf.c: revision 1.7
	usr.sbin/npf/npftest/Makefile: revision 1.1
	usr.sbin/npf/npftest/Makefile: revision 1.2
	usr.sbin/npf/npftest/libnpftest/Makefile: revision 1.1
	usr.sbin/npf/npfctl/npf_scan.l: revision 1.2
	usr.sbin/npf/npftest/npfstream.c: revision 1.1
	usr.sbin/npf/npftest/libnpftest/Makefile: revision 1.2
	usr.sbin/npf/npfctl/npf_scan.l: revision 1.3
	usr.sbin/npf/npftest/libnpftest/Makefile: revision 1.3
	usr.sbin/npf/npfctl/npfctl.h: revision 1.12
	sys/rump/dev/lib/libnpf/Makefile: revision 1.2
	usr.sbin/npf/npfctl/npfctl.h: revision 1.14
	sys/rump/dev/lib/libnpf/Makefile: revision 1.3
	usr.sbin/npf/npfctl/npfctl.h: revision 1.15
	usr.sbin/npf/npfctl/npf_ncgen.c: revision 1.9
	sys/net/npf/npf_ctl.c: revision 1.15
	usr.sbin/npf/npfctl/npf_var.c: revision 1.4
	usr.sbin/npf/npfctl/npf_var.h: revision 1.2
	usr.sbin/npf/npfctl/npf_var.c: revision 1.5
	sys/net/npf/npf_impl.h: revision 1.13
	sys/net/npf/npf_sendpkt.c: revision 1.10
	sys/net/npf/npf_impl.h: revision 1.14
	usr.sbin/npf/npfctl/npf_disassemble.c: revision 1.4
	sys/net/npf/npf_impl.h: revision 1.15
	sys/net/npf/npf_handler.c: revision 1.16
	usr.sbin/npf/npftest/libnpftest/npf_test.h: revision 1.1
	usr.sbin/npf/npftest/libnpftest/npf_processor_test.c: revision 1.1
	usr.sbin/npf/npfctl/npf_disassemble.c: revision 1.5
	sys/net/npf/npf_handler.c: revision 1.17
	usr.sbin/npf/npftest/libnpftest/npf_test.h: revision 1.2
	sys/net/npf/npf_ncode.h: revision 1.7
	usr.sbin/npf/npftest/libnpftest/npf_test_subr.c: revision 1.1
	usr.sbin/npf/npftest/libnpftest/npf_test.h: revision 1.3
	sys/net/npf/npf_ncode.h: revision 1.8
npf_tcp_inwindow: in a case of negative skew, bump the maximum seen value of
SEQ+LEN in the receiver's side correctly (using ACK from the sender's side).
PR/46265 from Changli Gao.
rumpnet_net: add pfil.c
Update rumpdev_npf; use WARNS=4.
Add initial NPF regression tests integrated with RUMP framework (running the
kernel part of NPF in userland).  Other tests will be added once converted to
RUMP framework.  All tests are in the public domain.
Some Makefile fixes from christos@.
- Fix double-free case on ICMP return case.
- npf_pfil_register: handle kernels without INET6 option correctly.
- Reduce some #ifdefs.
npfctl(8): add show-config command.  Also, update syntax.
npftest: add a stream processor, which prints out the TCP state information.
A tool for debugging connection tracking from tcpdump -w captured data.
npftest: add a module for TCP state tracking and add few test cases.
npf_state_tcp: add an assert; fix some comments while here.
- Rework NPF NAT syntax to be more structured and support future additions
  of different types and configurations of NAT.
- npfctl: improve disassemble and show-config command functionality.
- Fix custom ICMP code and type filtering.
make this compile again.
remove error(1) output
Remove superfluous Pp
- make each element of a variable hold a type
- change get_type to take an index, so we can get the individual types of
  each element (since primitive elements can be in lists)
- make port_range primitive
- add a routine to convert a variable of primitives to a variable containing
- only port ranges.
remove extra rule that got merged...
Ticket #354.