Add test utilities for shell permission identity am: 32ab28925d am: a16802f86e am: 18ca1b613f am: 4307862f72

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

Change-Id: I7b37085c693aa31ace77260ca197a51177049e4e
tree: 0d07bd31912724febd270bd84d06fbe3c0010b19
  1. staticlibs/