Networking guide

[Metallion]

We've often gotten questions about how networking is handled in Wakame-vdc. It is time we write a comprehensive guide. I have uploaded a WIP guide that I started writing months ago. It can be found in the doc-networking-guide. https://github.com/axsh/wakame-vdc/blob/doc-networking-guide/docs/content/networking/index.md

The WIP guide is copied as is from the old wiki so it needs some cleanup.

• The table of contents needs to be deleted. MkDocs will make one for us.
• Links need to be changed to MkDocs format.
• It's currently using a Q&A format but I think it's better to change it to a guide with chapters (like most other guides are right now.)

When finished, the guide should contain the following topics.

• Mention that Wakame-vdc uses bridged networking.
• A typical production setup with instances network Vs. management network.
• Explanation of how the intstances network and management network can be the same but it would mean that the WebAPI is exposed to instances.
• Explanation of how Wakame nodes communicate. (amqp)
• Examples of how to set up networks with vdc-manage.
• Explanation of dc_network vs network in the database and how to set/use them.
• Explanation of how firewalls are implemented.
• Mention of the config.netfilter_script_post_flush script.
• Mention of static NAT using the NATbox. Natbox setup itself should be a different guide.
• Mention of OpenVNet integration. How to do this should again be a separate guide.