Merge "Move utils from network stack to libs." am: f97ac209c2 am: d96c683595 am: 493f8b7b69 am: 4a4a60da0c am: 6d859d1e2e

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

Change-Id: I55c36bb60ea81f86daa193e9dff738846984e1e7
tree: a6247f47d7a6e1b92a01ba3ac00d896879192ad6
  1. Tethering/