Merge "Split NetworkUtils and NetworkUtilsInternal" am: caa437cae0 am: 15befc3d9e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1513140

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7b2eae7f9988ae8fa8c858709cafc17c1420f4b7