Fastboot-info testing

adding test to compare task list formed from fastboot-info vs list
formed from image list. To test, we need to set sparse_limit in flashing
plan and turn off update-super-optimization. The list of partitions to
be flashed by parsing fastboot-info should be a superset of the
partitions flashed by the hardcoded list. Changing is_retrofit_device()
to also take in a fastboot driver so we can pass in a mock

Test: fastboot_test
Bug: 194686221
Change-Id: Ib860c24c85779de1fbaa6bec8778e1f5ebb9475a