Start adding unit tests for the invariant device profile / Refactor

- removed redundant code to sort the device profiles
- removed DeviceProfileQuery class
- Added a helper method inside the test to easily generate
interpolation graph looks like:
https://docs.google.com/a/google.com/spreadsheets/d/1a1fdemrOqIDixiql77h0anWzUD3GlYfGsbP2FfIhyPM/edit?usp=sharing

Change-Id: Ia4c54a8d59a049c418c08d1b766f07ac6e1d0944