Add CNI daemonset example

[adleong]

When running linkerd as a daemonset in a CNI environment (such as Calico or Weave) we need to set hostNetwork on the daemonset spec and on the daemonset and localnode transformer configs. We should have example configs demonstrating this.

[adleong]

e.g. this: https://github.com/apprenda/kismatic/blob/master/ansible/roles/addon-linkerd/templates/linkerd.yml