[automerger skipped] Add a test for starting the legacy VPN. am: 3103a6ee03 am: 6995503731 -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: Ifee93b0591d129129731d6dcf9c47e0a6ca2f5a9
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