[WIP] dont ship default v2_key on cfme appliance

manageiq appliance:

No change.  Default `v2_key` to make out of box experience as smooth as possible.

cfme appliance:

Don't ship with a default `v2_key`. Focus on flexibility over customer experience.

Discussion:
- [ ] Do we want modify `appliance_console` to be able to generate a key?

/cc @chessbyte @jrafanie @Fryguy