Move duplicate functions and variables to resolv_test_utils. am: 71fff449

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2189661



Change-Id: Ia6e99c5e5c184247b1330e5218265748f2a16042
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>