Revert "bsnmpclient(3): make it thread-safe"

This reverts commit 89e3d5671ba13dceca272d5b159c9bd805f3f504.

As pointed out, there are several problems with that commit:

1. The new semantics, while useful for clients where multiple
threads use separate contexts, breaks clients which correctly
share a single one
2. Change in semantics would require a library version bump
3. It doesn't build with GCC

bsnmpclient(3): make it thread-safe

Reviewed By: harti
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27336

Add IPv6 transport for bsnmp.

This patch adds a new table begemotSnmpdTransInetTable that uses the
InetAddressType textual convention and can be used to create listening
ports for IPv4, IPv6, zoned IPv6 and based on DNS names. It also supports
future extension beyond UDP by adding a protocol identifier to the table
index. In order to support this gensnmptree had to be modified.

Submitted by: harti
MFC after: 1 month
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D16654

style(9): clean up trailing whitespace

MFC after: 3 weeks

In bsnmpd(1) add support for SNMPv3 message processing model, including message authentication, packet encryption & view-based access control (RFC 3412, 3414, 3415).

Sponsored by: The FreeBSD Foundation
Reviewed by: philip@ (mostly)
Approved by: philip@

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

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.

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

Virgin import of bsnmpd 1.10

Virgin import of bsnmpd 1.7

Virgin import of bsnmpd 1.5a

Virgin import of bsnmp 1.4