Add a function to query enforceDnsUid setting am: 37ade6cc am: e26fa99d am: b50fb689

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2753509



Change-Id: Ie390a59433128acfce4e2604a43e6b58c24969ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>