This commit adds basic support to run in compatibility mode with
Flannel. This allows clusters running Flannel as their principal
networking solution to leverage some advances Kilo features. In certain
Flannel setups, the clusters can even leverage muti-cloud. For this, the
cluster needs to either run in a full mesh, or Flannel needs to use the
API server's external IP address.
This commit enables Kilo to work as an independent networking provider.
This is done by leveraging CNI. Kilo brings the necessary CNI plugins to
operate and takes care of all networking.
Add-on compatibility for Calico, Flannel, etc, will be re-introduced
shortly.
Today, net.Listen will only listen on 127.0.0.1 if localhost is passed
[0]. Listening on `:8080` will open a dualstack socket on OSs that
support it.
[0] https://github.com/golang/go/issues/9334
