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

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

Simplify always evaluated branch (`e != NULL`)

- xalloc(..) ensures that e will be non-null via malloc + err.
- `e` is already dereferenced above, so logically it's impossible
to hit the lower test without crashing if it was indeed NULL.

MFC after: 3 days
CID: 1007408
Reported by: Coverity
Sponsored by: EMC / Isilon Storage Division

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.

Vendor patch: add support for the BITS construct and enumerations in both
gensnmpdef and gensnmptree. Add include and typedef directives to gensnmptree.

Submitted by: soc-sheryana (partly)

Virgin import of bsnmpd 1.12

Vendor fix: initialize the flag field of a newly created node to be 0.

Submitted by: jasone

Virgin import of bsnmpd 1.11

Virgin import of bsnmp 1.9

Virgin import of bsnmpd 1.8

Fix the 4.X -> 5.X upgrade path by include <inttypes.h> instead of
stdint.h.

Virgin import of bsnmpd 1.7

Import of bsnmpd 1.6

Virgin import of bsnmpd 1.5a

Virgin import of bsnmp 1.4