[automerger skipped] Merge "Support learning the NAT64 prefix from two different sources." into rvc-dev am: 4f7f6d67e9 -s ours

am skip reason: Change-Id Ic7452431d2d9aea1ae59b67a9d8383c6cc5b3902 with SHA-1 54fb93fbde is in history

Change-Id: I6724e192ae3ad62fd44ead33369f76c9d7709525
tree: cda2f49d8628181de3eb6dd2f934d91e1e01f932
  1. core/
  2. services/
  3. tests/