* fix(kubernetes): Fix mis-spelled API group

The networking.k8s.io API group is mis-spelled as network.k8s.io;
fix this. This bug is preventing security groups from being cached
by clouddriver.

We also should accept extensions/v1beta1 as the API group, which can
still be returned from clusters running Kubernetes < 1.16.

* fix(kubernetes): Fix test broken by prior commit