Merge "Move shared methods to NetUtils" am: ac148e6bfe am: 60de0b8a53 am: a2d2cbc185

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1d083dd60d2a6c863462fb62cb9c819ed8a5825d