Merge "fail *hard* if TrafficController::start() fails" am: feb83ba675

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2166684

Change-Id: Iea63b0005a196d2ce01e27b8cc7c0432f573ac81
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>