Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

tcpdrop: allow TCP connections to be filtered by cc-algo

In addition to filtering by stack and state, allow filtering
by the congestion control module used. Choose the command line
options to be consistent with the ones of sockstat.

MFC after: 1 week
Sponsored by: Netflix, Inc.

tcpdrop: update man page, since the fastack stack has been removed

MFC after: 1 week
Sponsored by: Netflix, Inc.

Remove empty line accidently introduced in r323626.

Add references. Suggested by Maxim Konovalov.

Sponsored by: Netflix, Inc.

Bump date missed in r323596. Trim trailing whitespace.

Sponsored by: Netflix, Inc.

Add a description how tcpdrop handles the case of specifying the
-s and the -S option.

Sponsored by: Netflix, Inc.

Allow TCP connections to be filtered by stack and state.

Choose the command line options to be consistent with the ones of
sockstat.

Sponsored by: Netflix, Inc.

use .Mt to mark up email addresses consistently (part2)

PR: 191174
Submitted by: Franco Fichtner <franco@lastsummer.de>

Allow the address and ports to be separated by a colon or period rather
than a space to permit directly pasting the output of commands such as
netstat and sockstat on the command line.

Reviewed by: net
MFC after: 1 week

o Remove an incomplete sentence.

PR: docs/156593
Submitted by: Yuri Pankov
MFC after: 1 week

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.

o) Restructure tcpdrop(8) to provide a facility to try to drop all established
connections. Including a flag to instead output a sequence of tcpdrop(8)
invocations that would accomplish the same thing, which is convenient for
scripting.
o) Make tcpdrop complain if the addresses given to it are entirely in different
address families, rather than failing silently.
o) When cross-referencing httpd(8), do not explicitly specify the apache2 port,
since the example in question is generic.

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

- Remove MLINKS to nonexistant manpages
- Change some section numbers to match reality
- For MLINKS to manpages from ports, mention which port installs them

MFC after: 3 days

o Improve the example a bit.

Submitted by: hrs

Sort xrefs

o Replace OpenBSD-specific example by FreeBSD's one.

Noticed by: Daniel O'Connor

o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8)
utility:

The tcpdrop command drops the TCP connection specified by the
local address laddr, port lport and the foreign address faddr,
port fport.

Obtained from: OpenBSD
Reviewed by: rwatson (locking), ru (man page), -current
MFC after: 1 month