Add file name and line number to libsnapshot logs am: 7f0429fba5 am: a2a51e586a am: 34271dcd52

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2523500

Change-Id: I72d6fe1f4cf9b7f8e1bf85ee710175a2f3f15355
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>