Merge "Make the MTU tests more realistic." am: 0c11c6d29d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2554476

Change-Id: I67f4c80afcd15314f90fd2ac44a054cc8d44826b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>