Files are taken from cluster/network-plugins/{bin,conf} to be consumed within a vagrant kube-up.sh environment.
Paths used for configuration files and the 'cni' name of the network provider are all from the kubernetes documentation, but the actual implementation in the salt automation doesn't seem to exist.
Cluster Configuration
The scripts and data in this directory automate creation and configuration of a Kubernetes cluster, including networking, DNS, nodes, and master components.
See the getting-started guides for examples of how to use the scripts.
cloudprovider/config-default.sh contains a set of tweakable definitions/parameters for the cluster.
The heavy lifting of configuring the VMs is done by SaltStack.