Merge "Add IPv6TetheringCoordinator unit test" into rvc-dev am: 8caf921dc8

Change-Id: Ic4a4803bea140bc567e9a2a3e35a40652e7285be
tree: e7f0ef77e439f61c3e7afe9acb5ff48abaeb3f54
  1. Tethering/