Add onUserAdded/Removed methods

These will handle the logic of Android users being added/removed from
the device instead of the system calling the various reset/sync methods.

(cherry-picked from commit fd777e7111ce01c672706867302db08371e5afce)

Change-Id: Ic6be0de63cc1b0579a46e7101dcfeb1a9ffa4738
3 files changed
tree: bb45743eae8c8e81a718f9e39e576547702557ff
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/