Network policy example

[niallthomson]

Add ability to install the Cilium CNI with the blueprints addon and add sample network policies that lock down communication between the components.

General rules:

• UI can communicate with all services
• Checkout can communicate with orders
• Components that have dependencies like MySQL must be able to communicate with them

The Terraform should be behind a flag called something like network_policies_enabled

[niallthomson]

Now that network policies are natively supported by the AWS VPC CNI this implementation can leverage that functionality.

[sudanpsg]

@niallthomson assign this to me