chore: rename v1 node configs to v1alpha1

This PR moves to using v1alpha1 as the inital node config version, so
we can graduate these configs a little more cleanly later on.

Signed-off-by: Spencer Smith <robertspencersmith@gmail.com>

pkg/userdata/v1alpha1/generate/init.go

@@ -0,0 +1,64 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package generate
+
+import (
+	v1alpha1 "github.com/talos-systems/talos/pkg/userdata/v1alpha1"
+	yaml "gopkg.in/yaml.v2"
+)
+
+func initUd(in *Input) (string, error) {
+
+	machine := &v1alpha1.MachineConfig{
+		Type:    "init",
+		Kubelet: &v1alpha1.KubeletConfig{},
+		Network: &v1alpha1.NetworkConfig{},
+		CA: &v1alpha1.MachineCAConfig{
+			Crt: in.Certs.OsCert,
+			Key: in.Certs.OsKey,
+		},
+		Token: in.TrustdInfo.Token,
+	}
+
+	certSANs := in.GetAPIServerSANs()
+
+	cluster := &v1alpha1.ClusterConfig{
+		ClusterName: in.ClusterName,
+		ControlPlane: &v1alpha1.ControlPlaneConfig{
+			Endpoint: in.ControlPlaneEndpoint,
+			IPs:      in.MasterIPs,
+			Index:    in.Index,
+		},
+		APIServer: &v1alpha1.APIServerConfig{
+			CertSANs: certSANs,
+		},
+		ControllerManager: &v1alpha1.ControllerManagerConfig{},
+		Scheduler:         &v1alpha1.SchedulerConfig{},
+		Etcd:              &v1alpha1.EtcdConfig{},
+		Network: &v1alpha1.ClusterNetworkConfig{
+			DNSDomain:     in.ServiceDomain,
+			PodSubnet:     in.PodNet,
+			ServiceSubnet: in.ServiceNet,
+		},
+		CA: &v1alpha1.ClusterCAConfig{
+			Crt: in.Certs.K8sCert,
+			Key: in.Certs.K8sKey,
+		},
+		Token: in.KubeadmTokens.BootstrapToken,
+	}
+
+	ud := v1alpha1.NodeConfig{
+		Version: "v1alpha1",
+		Machine: machine,
+		Cluster: cluster,
+	}
+
+	udMarshal, err := yaml.Marshal(ud)
+	if err != nil {
+		return "", err
+	}
+
+	return string(udMarshal), nil
+}