Add new CRD for etcd snapshots

Also adds a hack go script to print the embedded CRDs, for developer use.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

hack/crdgen.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"os"
+
+	k3scrd "github.com/k3s-io/k3s/pkg/crd"
+	_ "github.com/k3s-io/k3s/pkg/generated/controllers/k3s.cattle.io/v1"
+	"github.com/rancher/wrangler/pkg/crd"
+)
+
+func main() {
+	crd.Print(os.Stdout, k3scrd.List())
+}