Merge "Add unit tests for probing" am: 73990178e5

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2383976

Change-Id: Ie634049f9614b20f6c43f647336e06b7fd8868f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>