Populate error message if apexd verification fails

Test: atest CtsStagedInstallHostTestCases
Test: adb install --wait system/apex/shim/com.android.apex.cts.shim.v2_wrong_sha.apex
Bug: 136548037
Bug: 122952270
Change-Id: I5ea596ea6417825845c16bbb6e26e9c13845139b
2 files changed