This updates the kubernetes version used when deploying via
kubeadm to v1.12.2, which matches what is deployed via minikube
for the single node jobs
This required updating the apiVersion in the kubeadm configuration
file template, as well as removing the --cadvisor-port flag from
the kubelet args, as this has been removed entirely
Change-Id: I26573de35529ce44e91e6d4d4530f608b8cee476
8e8193f9e1