Some framework fixes for apps on sd

Some framework fixes for apps on sd
change hard coded path in installd
fix tests
Work around for renaming containers.
Do forced unmount when destroying containers.
Force a gc in default container service to release handle to parsed package
and thus avoid getting killed by vold
Some cosmetic changes to PackageManager api.
Unit tests for renaming container for MountService
Remove internal size limit on app to be installed.