[automerger skipped] Merge "Add a CTS test for private DNS on VPNs." into pi-dev am: a7df60640f -s ours
am skip reason: Change-Id Ifa2710aed7e773a24786cc3e4912f126547dfe0b with SHA-1 3b160e2385 is in history

Change-Id: I351adf65d7cefb1a97ddee9a80ed9978b28d0187