Bypass staged installer whitelist check while testing

Use pm shell command to bypass staged installer whitelist check during
testing.

Bug: 148664742
Test: atest StagedInstallTest NetworkStagedRollbackTest
Test: atest RollbackManagerHostTest
Test: atest ApexShimValidationTest
Test: atest AtomicInstallTest
Test: atest InstallUtilTest
Change-Id: Id546de753b9073391ee9baf3d4b9e2856ac94fac
2 files changed