Do not pin k8s vsn in 840 smoke test

test/840_weave_kube_3_test.sh

@@ -29,9 +29,7 @@ docker_on $HOST1 run --rm --privileged --net=host --entrypoint=/usr/sbin/ipset w
 docker_on $HOST1 run --rm --privileged --net=host --entrypoint=/usr/sbin/ipset weaveworks/weave-npc add test_840_ipset 192.168.1.11
 
 # kubeadm init upgrades to latest Kubernetes version by default, therefore we try to lock the version using the below option:
-#k8s_version="$(run_on $HOST1 "kubelet --version" | grep -oP "(?<=Kubernetes )v[\d\.\-beta]+")"
-# Hack! Override version here as installation via package is broken http://github.com/kubernetes/kubernetes/issues/57334
-k8s_version="v1.8.5"
+k8s_version="$(run_on $HOST1 "kubelet --version" | grep -oP "(?<=Kubernetes )v[\d\.\-beta]+")"
 k8s_version_option="$([[ "$k8s_version" > "v1.6" ]] && echo "kubernetes-version" || echo "use-kubernetes-version")"
 
 for host in $HOSTS; do