Add ability of connecting recovery iso to droplet.

[mhameed]

Thanks for your effort in developing doctl.

Using the digital ocean web interface, one can connect a recovery iso, and change if a droplet is booting from disk or from iso. This functionality is not currently exposed using doctl.

[ProgrammingPirates]

Hi , I’d like to work on this issue. Please assign it to me. @andrewsomething