[Code Health] Move 'using' out of functions am: 592e8227 am: eaa76e62 am:...

[Code Health] Move 'using' out of functions am: 592e8227 am: eaa76e62 am: a3f8533b am: f8c0e471 am: 62ca9cbc am: 307e7532

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2746594



Change-Id: I9c31590c0a66020056ccd0df815fa90b8a0fff9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>