Fix multiple vulnerabilities of ntp.

Approved by: so

Fix multiple ntp vulnerabilities.

Security: FreeBSD-SA-16:24.ntp
Approved by: so

Fix ntp multiple vulnerabilities.

Approved by: so

Fix BIND remote denial of service vulnerability. [SA-16:08]

Fix multiple vulnerabilities of ntp. [SA-16:09]

Fix Linux compatibility layer issetugid(2) system call
vulnerability. [SA-16:10]

Security: FreeBSD-SA-16:08.bind
Security: FreeBSD-SA-16:09.ntp
Security: FreeBSD-SA-16:10.linux
Approved by: so

o Fix invalid TCP checksums with pf(4). [EN-16:02.pf]
o Fix YP/NIS client library critical bug. [EN-16:03.yplib]
o Fix SCTP ICMPv6 error message vulnerability. [SA-16:01.sctp]
o Fix ntp panic threshold bypass vulnerability. [SA-16:02.ntp]
o Fix Linux compatibility layer incorrect futex handling. [SA-16:03.linux]
o Fix Linux compatibility layer setgroups(2) system call. [SA-16:04.linux]
o Fix TCP MD5 signature denial of service. [SA-16:05.tcp]
o Fix insecure default bsnmpd.conf permissions. [SA-16:06.bsnmpd]

Errata: FreeBSD-EN-16:02.pf
Errata: FreeBSD-EN-16:03.yplib
Security: FreeBSD-SA-16:01.sctp, CVE-2016-1879
Security: FreeBSD-SA-16:02.ntp, CVE-2015-5300
Security: FreeBSD-SA-16:03.linux, CVE-2016-1880
Security: FreeBSD-SA-16:04.linux, CVE-2016-1881
Security: FreeBSD-SA-16:05.tcp, CVE-2016-1882
Security: FreeBSD-SA-16:06.bsnmpd, CVE-2015-5677
Approved by: so

Upgrade NTP to 4.2.8p4.

Security: FreeBSD-SA-15:25.ntp
Security: CVE-2015-7871
Security: CVE-2015-7855
Security: CVE-2015-7854
Security: CVE-2015-7853
Security: CVE-2015-7852
Security: CVE-2015-7851
Security: CVE-2015-7850
Security: CVE-2015-7849
Security: CVE-2015-7848
Security: CVE-2015-7701
Security: CVE-2015-7703
Security: CVE-2015-7704, CVE-2015-7705
Security: CVE-2015-7691, CVE-2015-7692, CVE-2015-7702
Approved by: so

Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add a sentence to the man page explaining that the -d option
can only be used when ntpd is compiled with DEBUG support.

PR: docs/138206
Submitted by: Oliver Pinter (oliver dot pntr at gmail dot com)
MFC after: 5 days
Approved by: roberto

Correct typo: thetime -> the time

PR: docs/139447
Submitted by: Guido Falsi mad at madpilot dot net

Delete description of non-existent options: "-4" and "-6".

ntpd's "-4" and "-6" options are described in the original documentation
(contrib/ntp/html/ntpd.html). It may be original's doc bug.

PR: docs/112642
Submitted by: Seth Hieronymus<shieronymus@speakeasy.net>
Discussed with: ume
MFC after: 1 week

- Fix typo in ntpd(8).

Noticed by: Ben Kaduk (minimarmot _at_ gmail.com)
Approved by: delphij@ (mentor)

Markup fixes.

- Update to ntp-4.2.0

PR: docs/79857
Submitted by: Tsurutani Naoki <turutani@scphys.kyoto-u.ac.jp>

Expand *n't contractions.

Eliminated double whitespace.

The .Nm utility

Fix spelling errors: minumum, overriden, inheritted

MFC after: 3 weeks

Update the mdoc NTP documentation transcribed from the HTML documentation
for ntp-4.1.0.

Unfortunately, David Mills insists on managing the documentation in
such a way as to make it impossible for me to make things easy on our
translators, without printing out the documentation and reading through
it side-by-side with a finger on each page.

mdoc(7) police: use the new features of the Nm macro.

Fix more HTML -> mdoc transcription errors.

Submitted by: Kazu TAKAMUNE <takamune@avrl.mei.co.jp>

Merge into the manual pages the changes from 4.0.99b:
ntpd.8:
add -gx to SYNOPSIS
clarify explanation of -g
ntp.conf.5:
add missing field description for rawstats lines

Install audio.htm, driver3[567].htm and qth.htm.

Move the Variables section of the old ntp_misc(8) manual page to
the correct location in the ntpd(8) page.

Abandon hope of keeping in line with the author's structure,
in favour of placing information in the correct sections.

The ntp_acc(8), ntp_auth(8), ntp_clock(8), ntp_conf(8),
ntp_misc(8) and ntp_mon(8) pages have been merged into
ntp.conf(5) and ntp.keys(5).

Requested by: rgrimes, wollman

Add selected manual pages transcribed from the HTML documentation.
Those pages which have not been transcribed are referenced as
gracefully as possible.

There is no perfect section for the ntp_* files, which document
configuration options for the NTP suite, so I'm putting them in
the same section as the pages for the utilities themselves.