Add CTS coverage for VpnTransportInfo. am: e9aeb3c1c5 am: fc5b95502b am: eb54554df9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1570841

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia72203b97fe7d75268160c54b247fb39acf17355
tree: 06df6bbe42bbcbe0938bdd10413715a9ab753923
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING