First pass at link aggregation chapter. Another nit-pickier commit to follow.

Sponsored by: iXsystems
Fix typo.
Finish editorial review of this chapter.

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White space fix only. Translators can ignore.

Sponsored by: iXsystems
Add a manual page entity for poudriere.  Fun fact: "poudriere" is French
for "powder keg".
Start review of firewall chapter.
Many more commits to follow.

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White space fix only. Translators can ignore.

Sponsored by: iXsystems
Shuffle the first part of this chapter to improve its readability.
Many more commits to come.

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Update with new key.
Finish subsection on enabling PF.
Comment out pfsync section for now as it is no longer true. At some point
a section should be adding demonstrating how to use it.

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White space fix only. Translators can ignore.

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Update the carp(4) section for 10.x and later.  Allan Jude
<freebsd@allanjude.com> supplied a great patch to fix this, and then
spent a lot of time changing it to meet my numerous too-strict
standards.

PR:		docs/186464
Submitted by:	Rainer Duffner <rainer@ultra-secure.de>
Reviewed by:	glebius (earlier version)
Whitespace-only fixes, translators please ignore.  Slightly modified
patch supplied by Allan Jude.
Fix repeated "A a".

Submitted by:	Allan Jude <freebsd@allanjude.com>
Document __FreeBSD_version value 1100008.
- Merge the following from the English version:

	r21479 -> r22118	head/ja_JP.eucJP/books/handbook/preface/preface.xml
Cleanup the ALTQ section.
At some point, a FreeBSD specific example should be added.

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White space fix only. Translators can ignore.

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Continue to shuffle and improve flow of this chapter.
Many more commits to come.

Sponsored by: iXsystems
White space fix only. Translators can ignore.

Sponsored by: iXsystems