Move aports/firmware to aports/nonfree-firmware
Created by: ollieparanoid
Added a test case as well. When there's still an aport in the old folder, it errors with something like:
The 'aports/firmware' folder has been renamed to 'aports/nonfree-firmware'. Please move 'firmware-asus-flo', 'firmware-adreno' to the 'aports/nonfree-firmware' folder.
Closes #756 (closed).