More robust tests.

https://android-build.corp.google.com/test_investigate/?invocationId=I89000010151050377&testResultId=TR75528603005220067

Bug: 275409981
Fixes: 279547610
Test: atest PackageManagerTests

Merged-In: Id68a28e9dc12f71286e29822d4b88be88ab03653
Change-Id: I49d88dbba79f7bcd8cfb8c72d2605671f27935b2
1 file changed