Add a default ON flag for DNS fail-fast feature am: 08422a0d am: d3974872

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



Change-Id: I028e15966175d74c3944c22c451fa56b3ede30d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>