Merge "Move utils from network stack to libs." am: f97ac209c2 am: d96c683595

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1350083

Change-Id: Ia163bc416e16ce56fc96855c1111a9905b712843
tree: 5ec0fb5d4e1c9a35c7f1def392befa98d54a9113
  1. Tethering/