Merge "Use unique_fd instead of int on socket" am: 7711eb1b am: 204dcfc2 am: 3299cbf3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2202415



Change-Id: Ic0e5d24a664da7ed3ae5a99f66ecade7770c123a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>