Add a few additional system attributes.

In addition to the system level serial number, manufacturer, and product name,
we should also have attributes for the chassis-level ones.
Add a role-provided jig.

This jig just delegates back to a role provided do_transition method.
Let jig run logic know about nodes that are no longer alive.

With the addition of the role-provided jig, the run may have marked the node as
not alive to faciliate a reboot from outside sources.  We need to handle that case.
Merge pull request #283 from VictorLowther/add-role-provided-jig

Add role provided jig