Automate - add "finished" state to all provisioning and retirement
statemachines.

Created new /system/methods/statemachine_methods class, with new
 instances for each of the provision combinations and new method
statemachine_finished.

https://bugzilla.redhat.com/show_bug.cgi?id=1132115
Merge pull request #426 from tinaafitz/state_machine_new_finished_state

Automate - add "finished" statemachine state.