Create unit tests for interacting with hardware

[jathanism]

There are currently no unit tests for interacting with hardware. Since this is one of the core features of Trigger's revolving around remote execution and processing, we need these so we can be confident that code-changes will not break HW interactions.

We need:

• HW interactions used by gong are unit-testable
• HW interactions used by load_acl are unit-testable
• HW interactions used by trigger.twister are unit-testable
• HW interactions used by trigger.cmds.Commando are unit-testable.

This should probably be broken into multiple issues, but this is is a good start.

[jathanism]

CC @tcuthbert