* Don't rename doc.go since it's expected by k8s code generator
Currently fake client-go client sets are broken, e.g. we have[1]
var gatewaysResource = schema.GroupVersionResource{Group: "networking", Version: "v1alpha3", Resource: "gateways"}
which should really be
var gatewaysResource = schema.GroupVersionResource{Group: "networking.istio.io", Version: "v1alpha3", Resource: "gateways"}
This is because
1. kubetype-gen generated apis are missing groupName comment tag (addressed by istio/tools#549)
2. k8s code generator expects groupName comment tag to be in doc.go but it is currently getting renamed to doc.gen.go
This change fixes 2.
[1] 21751e6cf0/pkg/clientset/versioned/typed/networking/v1alpha3/fake/fake_gateway.gen.go (L21)
* Run `make update-common`
* Regenerated k8s client