Experiment: 2-networking-factory

[sruffilli]

This (very drafty) PR is meant as a playground for a FAST networking stage that heavily leverages factories to manage VPCs and connectivity.

Some architectural choices I would like to discuss:

• Projects are defined in terraform, to avoid having a dedicated project factory within networking
• Connectivity is an attribute of each VPC (vs. having both a VPC factory and a connectivity factory). This feels very natural to me, as each VPC manages its own "wires"
• Managing NVA connectivity is Really Hard and Really Messy. A drop-in solution could be published together with a specific recipe, but I wouldn't want to add it to the factory

TODO:

• "Factory"-ize net-vpc
• "Factory"-ize project
• "Factory"-ize DNS
  • Support public zones (?)
• Implement VPN connectivity
  • Basic implementation
  • Handle cloud router management
• Implement peering connectivity
• Implement NCC connectivity
  • Basic implementation
  • Handle route filtering
  • Handle connectivity groups
  • Handle dynamic spokes
  • Handle PSA spokes
• Implement VLAN Attachments (Interconnects are imho out of scope)
• All sub-factories should be located in the recipe directory
• Implement NVA connectivity (?)

[sruffilli]

Per conversation with @ludoo and @juliocc, adding project and ncc management to the scope of the factory