[automerger skipped] Move DnsPacket to libs/net am: a3da5a8ea3 am: 8b58beb972 -s ours am: 7ed2d18814 -s ours am: 4020a476c9 -s ours

am skip reason: Change-Id Id12aaedb6dd75144ca9b58b94bfcd845a1f16360 with SHA-1 2950a64eec is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1339713

Change-Id: Ib35cf001c0f1677e9da5f93140f1411541b4545b