Add a default ON flag for DNS fail-fast feature am: 08422a0d am: 628c2958

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2821511



Change-Id: I85ba0f4596a1899606bfa8443c89ce92b061de22
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>