Device Only Power Control

[barbourshop]

Goal: To create a device only power control module

This would mean the user would list the device's power switch in the racks' config as "device only"(or similar name, TBC) and then when the self.reboot of test controller is called shutdown -r would be written into the device console.
Since this method would require access to the devices console, the powerOn and powerOff methods of this powerModule would need to be bypassed.

Acceptance Criteria:

• A new device only power module exists that can successfully reboot devices via their console exist.
• A unit test exists to check that the power module behaves correctly.