Fix package cleanup when parsed APK missing.

Recently the uninstall logic was changed to require a parsed APK to
succeed, but we need uninstall to succeed when the APK lives on an
ejected storage device.

To fix that case, create a fake parsed package with just enough
information for the delete to proceed.

Fix package movement bug that sent an invalid user ID to installd;
we need to explicitly ask for each user.

Bug: 28658206
Change-Id: Icf417661f07688c7523f0d082528adec2ac70cc6