Architecture Design Guide restructure work items

= Architecture Design Guide Restructure= 'Do not modify the current guide in openstack-manuals/docs/arch-design. Commit your work to the draft directory openstack-manuals/docs/arch-design-draft.'
 * Please ensure your commit messages references the blueprint: Implements: blueprint arch-guide-restructure

Resources
Newton specification

Ocata specification

Arch Guide-reviews

Cloud architect article

Pike release goals

 * Focus on writing the Design chapter
 * Highest priority is completing the storage and networking sections
 * Complete other sections in the Design chapter
 * Develop a use case template
 * Remove arch content from the ops guide since it has been migrated to the arch guide
 * Archive the current arch guide

Tasks

 * Rearchitect the storage chapter

Ocata release goals

 * Complete compute section in Design chapter
 * Publish draft guide to openstack-manuals (TBC)

Tasks
To assign yourself a task, put your name next to the section or task and reference the review URL. Change the status to DONE when the task is completed.

Newton goals

 * Migrate http://docs.openstack.org/ops-guide/architecture.htm content to the Arch Guide under the relevant sections:
 * architecture.rst (Darren) https://review.openstack.org/#/c/324179/ Merged
 * arch_storage.rst (Darren) https://review.openstack.org/#/c/324179/ Merged
 * arch_scaling.rst (Darren) https://review.openstack.org/#/c/324179/ Merged
 * arch_provision.rst <- Change title to planning and move to the Arch Guide (Darren)
 * arch_network_design.rst <- Move to network Section in Arch Guide. (Shaun)
 * arch_example_thoughts.rst <- Decide what to do with this content
 * arch_example_network.rst <- Move to network Section in Arch Guide (Shaun)
 * arch_example_neutron.rst <- Move to network Section in Arch Guide (Shaun)
 * arch_compute_nodes.rst (Darren) https://review.openstack.org/#/c/324179/ Merged
 * arch_cloud_controller.rst <- Move to control plane section DONE (Darren)