Adding test cases for getInstalledPackages

There was an earlier fix for a case where the binder
heap would run out of space when calling the
getInstalledPackages. This could happen when there were
a lot of installed packages.

This change adds some test cases to verify that fix.

Change-Id: I8e0c5f674bf2098adcff6d40893f94162961031f
7 files changed