Rework the way PackageManager binds to default container service.

Clean up stale containers when enabling/disabling packages on sdcard.
Check the path of packages which are being enabled.
Make sure gc's are done prior to destroying containers when moving applicati
as well as enabling/disabling packages for sdcard mount status changes.

Some miscellaneous issues
   Remove hack to avoid renaming containers.
   Fix test with forward locked apps
   Remove adding container id to asec list when renaming
   Some cosmetic changes to DefaultContainerService