Merge "Use IpUtils, NetworkStackConstants in DadProxyTest" am: 80794b2476 am: 303cd3e30b am: 32950484f5 am: b96443ba66

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440214

Change-Id: I4a078231e0145973c413f8dcb127275987eec8de