DevExp: Implement rover walkthrough functionality

[davesee]

There are several repos and steps to get a completed CAF deployment completed. To make these steps more concrete, the rover --walkthrough command guides developers through the process.

• Clone landing zones repo
• Clone Starter repo
• Starter configuration selection
• Auto generation of all deployment and destroy commands in respective executable sh files
• Deployment of platform (launchpad, levels 0, 1, 2) and available app configurations in the selected