Add test utilities for shell permission identity am: 32ab28925d am: a16802f86e

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

Change-Id: I10bfba80f29900c0b91da62e65e16e7264a8a9b5
tree: 0d07bd31912724febd270bd84d06fbe3c0010b19
  1. staticlibs/