Copy the remaining policies on migration.

* accountTypesWithManagementDisabled
* disableScreenCapture

For security logging nothing has to be done since the state is
stored in a system property, just changed it so that the logging
will be started after the migration and only events for the
right user are logged.

Also removed the todo about hardening for power cut case, the
risk of additional complexity sees to outweight the benefit.

Bug: 149075700
Test: atest DevicePolicyManagerServiceMigrationTest
Change-Id: I3a58325f2d6f415e51998c5096c5fc123d26602d