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: I5ceb6a6c37d1222358de9c6f3261da64f8010658
Merged-In: I5ea596ea6417825845c16bbb6e26e9c13845139b
(cherry picked from commit 4e7d24a71a8ad25dc9b49c6da922702fb5ef11ff)
2 files changed