prebundled: Handle prebundled packages per-user.

  Also add migration step for reading old file to go towards
  per-user system file structure

TICKET: CYNGNOS-1006
Change-Id: I743e8efaa074c9b84291fdc8d3d15763cc39e79d

pm: Create per-mcc prebundled install filter.

  If packages are region locked, avoid installing them
  for the SKU, otherwise if a package is specified for
  a mobile country code, allow it to be installed.

TICKET: CYNGNOS-912
Change-Id: I69c5be62dff771fc7d3117e9edf65d8ea4150f28

pm: Update PackageManagerSettingsTests.

Change-Id: Ib3a23514055935f68f3f3bb4fd2b2d4d495c1132

PackageManager : Extend prebundled logic

Instead of specifying which packages to explicitly install,
Only install packages if :

a) Its in the current mcc's config_region_locked_packages
b) Its not region locked by checking config_restrict_to_region_locked_devices

Change-Id: I74c13763ef367e16e5e79290a569f3a720b85adc