Lusis knife sce

The neccessary changes to fog got merged in today:

https://github.com/fog/fog/commit/b9c58fbc3a7e8cc88a2cdc83bc948497f6611fa2

High level overview:

- support for ohai hints automatically
- vlan support
- secondary ip support
- launch time volume attach support

This is not backwards compatible (though it likely doesn't matter much - hardly anyone uses SCE =P).

I changed the options for various settings for knife.rb so that you could have distinct settings for SCE outside of other cloud providers.