Migrate agent deploying from configure-and-deploy to deploy-and-configure

[piksel]

Steps that needs to be taking to allow this:

• [x] Encryption must be made optional in agent/core communication to allow for a generic MSI deployment
• [x] MSI or bootstrapper must prompt for server details
• [x] Core must accept a connection from an unknown Agent
• [ ] ...and add it to its database
• [ ] Unconfigured Agents must be marked as such in the database to allow for operator configuration