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

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

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/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Fix typos and spelling mistakes.

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.

english(4) police.

mdoc(7) police: Deal with self-xrefs.

mdoc(7) police: kill whitespace at EOL.

Approved by: re

The .Nm utility

Correct typos and macro usage.

PR: 33179, 33181, 33295
Submitted by: Norihiro Kumagai <kumagai@attbi.com>
Reviewed by: sheldonh (MAINTAINER)
MFC after: 2 days

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: split punctuation characters + misc fixes.

Prepare for mdoc(7)NG.

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

Remove trailing whitespace.

Work around mdoc macro argument limit.

PR: 18562
Submitted by: takamune@avrl.mei.co.jp (Kazu TAKAMUNE)

Fix a typo inherited from the HTML documentation:
assocation -> association

PR: 17501
Submitted by: Yoshihiko SARUMARU <mistral@imasy.org>

Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

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.