[automerger skipped] Add a test for starting the legacy VPN. am: 3103a6ee03 -s ours

am skip reason: Change-Id I3c4a94181bd71df68121fa0f71669fa4fa588bdd with SHA-1 7b76f806dd is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12330622

Change-Id: Ieff977b6742a93b3a8f335ff6022cf1fbdcec2e7
tree: d15e178a6690a7b8cb2d57e1f01b269ea2cb9bab
  1. core/
  2. services/
  3. tests/