Binder cache for isUserUnlocked update

Bug: 154434809

This change ensures that the isUserUnlocked binder cache will be
invalidated when a new UserManagerService or StorageManagerService is
created.  Note that the bug cannot be reproduced at will so it is not
known if this change actually fixes the bug (which has multiple
potential root causes).  However, by inspection, this change is
desirable.

Test: Run tests with an instrumented build.  No cache inconsistencies
were found:
  * UserManagerServiceCreateProfileTest
  * UserSystemPackageInstallerTest
  * UserManagerServiceUserInfoTest
  * UserManagerServiceIdRecyclingTest
  * PtsChreTestCases
  * UserLifecycleTests

Change-Id: Ibc1204ccc1458028d94f2a64cbdc8ec1234b1ef3