Add Support for saltstack.

Sledgehammer is updated to have saltstack software.

Create master and enable minions at all stages of bring-up.
Keys are sync between minions and master.

The jig is started, but not complete.

Comment away!
Do we plan on adding roles in Sledgehammer that require salt?  I would not update Sledgehammer until we do, as it involves pushing bits to our S3 bucket.