Add a function to query enforceDnsUid setting am: 37ade6cc am: 2bf32330...

Add a function to query enforceDnsUid setting am: 37ade6cc am: 2bf32330 am: c69e8645 am: 929bfb99 am: 64eac466

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



Change-Id: Ieed6b8b514ee94104e64924c458ed7a78c25add1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>