Merge "Move shared methods to NetUtils" am: ac148e6bfe am: 60de0b8a53 am: c1f73982c1

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1571849

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie594597da2288f5b4b672530d95803cfc6ee5bab