Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

bsnmp: Use libpfctl

Reviewed by: glebius
MFC after: 4 weeks
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D29642

Update bsnmp to version 1.13. This does not bring user-visible changes.
For developers gensnmptree can now generate functions for enums to convert
between enums and strings and to check the validity of a value.
The sources in FreeBSD are now in sync with the upstream which allows to
bring in IPv6 modifications.

style(9): clean up trailing whitespace

MFC after: 3 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Now actually implement reading/refreshing/returning data from the pfTablesAddrTable
and modify the BEGEMOT-PF-MIB to add support for IPV6 address' statistics in the PF
tables via pfTablesAddrNetType and pfTablesAddrNet. While here, upgrade the
pf_tree.def file to the new format that includes enumerated values. Also make sure
to return SNMP_ERR_NOSUCHNAME for ALTQ objects, if ALTQ is disabled, so that the agent
will know to skip the pfAltq subtree when servicing GETNEXT requests from SNMP clients
(otherwise snmpwalk on begemotPf would stop at the pfAltq subtree with bsnmpd returning
SNMP_ERR_GENERR).

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

The last big commit: let usr.sbin/ use WARNS=6 by default.

- Import the HEAD csup code which is the basis for the cvsmode work.

Use the new bsd.snmpmod.mk makefile to build the modules. The -I pointers
into the contrib directory are still necessary for some of the Makefiles,
because the C-sources there use non-canonical includes ("" includes) to get
at the header files.

Add snmp_pf, a bsnmpd module for monitoring (not managing!) pf firewalls.
Currently implemented are most things related to states and interfaces, todo
are address tables and altq. I've tried to keep this roughly in sync with a
project implementing this for net-snmpd.

Reviewed by: harti, dhartmei
MFC after: 1 month