Merge "tethering: DAD Proxy Daemon" am: 199613f2ef am: 692b986c12 am: 0b1738fbd8

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1258645

Change-Id: I308a9f5ba1b77fe1c3263a610354d76dc8b127ae