Utilities for better DNS query filtering in APF. am: cbe8bef21b

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2474764

Change-Id: Icee87eb038cf0f337bfc8c72dce0ca9d087b7082
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>