Merge changes from topic 'mockable-wifi'

* changes:
  Allow some HAL interactions to be mocked
  Allow libwifi-system to be mocked
tree: 7824418c4bc4e42f9580a4e7c3e156d7202ef148
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/