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!
saltstack seems to be a push style so masters push to minions.  This different than the normal chef-client pull from chef-server module.  As such, most things are done by salt commands on the master.  With this model, they combine the config management with the general monitoring and ad-hoc command execution.  salt functions as both the chef-client run and the knife ssh commands.  So, it is blurred.  With that said, I agree that saltstack-minion shouldn't be there by default for initial crowbar operation.  It should be in a deployment or indirectly from another role.   I had it that way to test the code without doing a full install.