Merge "Add unit tests checking MTU of interfaces are set." am: edbf34a182

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2335546

Change-Id: I180439564cab2fc3d15476dd26d995ca953bf89a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>