The old version of this code would silently truncate odd-length
Signatures. However, this masks some bugs. Add a throw of
IllegalArgumentException so users can easily see where they're getting
bad input for Signatures.
Also, go through the existing code and catch this exception or
pre-check the input strings so system_server doesn't crash later.
Bug: 5092338
Change-Id: I8c672c5eaeb738a92c4581ce0df09baf719980ef
Split PackageManagerService from one monolithic class with several inner
classes to several classes. This will help determining how its data
structures can be reshuffled to provide better separation of concerns.
Change-Id: Ic7571daebdcf13ce08e08f34204c5bbf4140139b
