Adds a test for raw_cpu_arch in _node_resource

Commit 5fd0500e7e262c602dc7bbbff456326598da41bc
makes it such that the cpu_arch is not
made canonical for scheduling, this adds a unit
test to cover the change.

Change-Id: I89080a0178b1098c2a297b7268fad279ece680c2
Related-Bug: #1366859
Merge "Adds a test for raw_cpu_arch in _node_resource"