Merge "Add utilities for network validation testing" am: ff15197c34 am: fe093f509b am: ab7803d2d4 am: 3ecfe55730

Original change: https://android-review.googlesource.com/c/platform/cts/+/1364518

Change-Id: Iad22a289629012f3894e16df3a67eb46a7f68ef8
tree: 7dacab5b8823ea92fa303500c8e3bd0706f9bcd5
  1. tests/