- Image selection based of Ubuntu series name (e.g. 'xenial')
- Kernel selection based on MAAS kernel names of 'ga-16.04'
or 'hwe-16.04'
- Validation that defined images and kernels are valid in the
current node driver
- Unit test for the validation
Change-Id: I6256a2e00a4594af38a2d862c738e03efb7ddb29