Merge changes from topic "headlessUI" into pi-dev

* changes:
  Rely on CarUserManagerHelper to decide on user list to show.
  Revert hide user 0 in settings userlist.
tree: 838b58a35b68962b67ce50704fbded11033cf782
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. PREUPLOAD.cfg