PLAN

First pass

• pull in runc into stage1
• proof-of-concept for rkt app add
• proof-of-concept for appc -> runc

Second pass

• Enable mounts
• Capabilities

app add design

Plan: create a separate subcommand, app add-runc (though I expect this will change), that accepts an image spec and a path to a config. Adds a stub application to the pod manifest. Writes a simple unit file.