Add test utilities for shell permission identity am: 32ab28925d am: a16802f86e am: 18ca1b613f am: 7433e0d516

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1435131

Change-Id: Ib4ed999b0d9a8d38d12af8119d8cffbe4b86a01c
tree: 95a0bfdfa46056f47ee8a02b4b85c5bbdff07f97
  1. staticlibs/