[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

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



Change-Id: Ief43ab9e756825fb7e4b2ecdee76a1f86cc82f93
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>