[xcuActor] Split out roughing pump and ion gauge into new roughingActor

This issue was initially filed into JIRA by 'cloomis' at 01/Oct/15 3:40 PM as ICS-14.
This issue was assigned to 'Steve Hope'.

The xcuActor currently controls a roughing pump and queries an ion gauge on the manifold between that pump and the turbo.

We will have two of these "roughing stations", backing up twelve xcuActors, and the roughing devices will be turned off most of the time. It makes sense to pull the control out of the xcuActor.

As long as we are only controlling one dewar (i.e. 2015Q3 work at JHU and LAM), this is not important.