* libkv upgrade is required for the docker discovery PR * vendor-in libnetwork contains an update to network plugin api (Thanks @WeiZhang555 : https://github.com/docker/libnetwork/pull/516) Signed-off-by: Madhu Venugopal <madhu@docker.com> Upstream-commit: 814c19591d875a747433f87ae84dffbf58c4d21a Component: engine