Merge "Log as warning when persistent setting file doesn't exist" into main am: 3b6db502f1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3003553

Change-Id: I98a419db4ef93929fb019d1439ca5c296e3466cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>