Restore lost unlocked users after vold reset

- In automotive, vold reset / resetIfBootedAndConnected() call can
  lose pending unlock request for a user if boot completion and
  unlock happens at the same time. In automotive, user unlock
  can happen before boot complete.

- After vold reset, check for such lost user (=marked unlocking or
  unlocked in UserManager level but is still locked in StorageManager
  level) and retry unlocking.

- This also undo previous CL to keep handler messages as that cannot
  prevent all the race, especially race of vold reset right after
  onUnlockUser call. But handler update is kept inside the service.

- The restoration is done only for automotive device for now as phone
  does not have such case.

Bug: 151457974
Test: try reboot in auto devices where this race can happen.
Change-Id: I3b50750f5602c805e79f79f061eed44f880b25bd