Multus with cni plugins scenario

This new scenario will install Multus with
Calico as the main CNI and some extra plugins
which are useful in certain networking use-cases.
These are already present in Kubespray and are
provided by the containernetworking project [1].

[1] https://github.com/containernetworking/plugins

Change-Id: I9367e23ebb3331f29095a09ba857f1b359b74d28
4 files changed