Merge "Add StructNdOptRdnss class to parse RDNSS option from netlink message." am: 3a8939f97b am: 36f4e85894

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1777767

Change-Id: I942c1589e6e9ca520015d577a466846ddae7b9fa