Consolidate and update networking section in the Architecture Design Guide

[Darren Chan]

In openstack-manuals/doc/arch-design-draft/source/capacity-planning-scaling.rst, add a networking section and complete the following:

1. Add information about neutron considerations with router design - DVR or centralized
2. Consolidate http://docs.openstack.org/arch-design/hybrid-architecture.html#network-services
http://docs.openstack.org/arch-design/generalpurpose-technical-considerations.html#designing-network-resources, http://docs.openstack.org/arch-design/network-focus-technical-considerations.html, http://docs.openstack.org/arch-design/network-focus-architecture.html#tunable-networking-components, http://docs.openstack.org/arch-design/multi-site-architecture.html#networking, http://docs.openstack.org/arch-design/hybrid-user-requirements.html#network-considerations, http://docs.openstack.org/arch-design/hybrid-architecture.html

Please note:
1. Do not modify the current guide in openstack-manuals/docs/arch-design. Commit your changes to the draft directory openstack-manuals/docs/arch-design-draft.
2. Please ensure your commit message references the blueprint: Implements: blueprint archguide-mitaka-reorg

For more information, see https://wiki.openstack.org/wiki/Architecture_Design_Guide_work_items and
https://blueprints.launchpad.net/openstack-manuals/+spec/archguide-mitaka-reorg

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/298284
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=cbb699f9972916b4cb950f38e4134222a808a4f6
Submitter: Jenkins
Branch: master

commit cbb699f9972916b4cb950f38e4134222a808a4f6
Author: “devon <email address hidden>
Date: Mon Mar 28 11:13:26 2016 -0400

    Architecture Design Guide - network related content

    This is incomplete and some information will need to be changed
    and updated by those with more technical knowledge.

    Implements: blueprint archguide-mitaka-reorg
    Partial-Bug: #1548182
    Change-Id: I5acc55878e27c19ad81eefee637494652ace2ed9
    Co-Authored-By: Victor Howard <email address hidden>

[Darren Chan (dazzachan)]

This bug is no longer relevant since we are restructuring the arch guide (again) for Newton. See http://specs.openstack.org/openstack/docs-specs/specs/newton/arch-guide-restructure.html