[automerger skipped] Fully setup test TUN iface on create. am: 5cbd7b38ca -s ours am: 5105c15011 -s ours

am skip reason: Merged-In I4c1262e566517bbb03dd610f595e4d18bc4e7735 with SHA-1 5cbd7b38ca is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/14969443

Change-Id: Ia3f6c15f1909215ae8ec4e926df8c3a3a3943bc6