Appliance console copy keys

This copies fetches keys from a remote machine if you do not yet have a `v2_key`
- [x]  ~~blocked on #550~~

![miq-0-configure-db](https://cloud.githubusercontent.com/assets/1930/4276695/9d061400-3d07-11e4-884c-dd2d9d826ed8.png)

![miq-1-fetch key](https://cloud.githubusercontent.com/assets/1930/4276711/c182aed8-3d07-11e4-89b6-4d0f3d3fbe3c.png)

-OR-

![miq-2-create-key](https://cloud.githubusercontent.com/assets/1930/4276628/08659f82-3d07-11e4-912a-12bdd1e4aa91.png )

Alternatively if you had chosen to generate a key (option 11), then you can overwrite an existing encryption key:

![miq-3-generate-key](https://cloud.githubusercontent.com/assets/1930/4276714/c853dfc0-3d07-11e4-8273-5413228599bb.png)

Same here with SSH.  Also, since ask_for_* puts `Appilance` and `Hostname` in the middle of a sentence, I think they should be lower-cased here.