This fixes#243 with following changes:
+ Optimize to fetch Pod from k8s client
+ Change to use cache always in DEL.
+ If failed to fetch the pod info from k8s clinet in deletion,
use cached delegates as emergency bailout
+ Add test cases for cache
This fix is to add declaration about clusterNetwork/defaultNetwork
net-attach-def is in 'default' namesspace. In addition, this code
changes to skip defaultNetwork in case of 'kube-system' namespace
as well (#202).
When multus is run inside a container, eg as a daemonset, we can use
InClusterConfig() to automatically get the service account token, the
CA certificate, and the apiserver address, all without a kubeconfig
file.
Plugin went away, replaced by a minimal Spec.Config field so that the CNI
version the thick plugin supports could be indicated. This means we need
to also inject the network name into the minimal CNI JSON config when
loading the Spec.Config if the network name isn't there already.
