Refactor the cloud-init metadata to return a netconf.NetworkConfig

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

config/cloudinit/datasource/metadata/gce/metadata.go

@@ -21,6 +21,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/rancher/os/netconf"
+
 	"github.com/rancher/os/config/cloudinit/datasource"
 	"github.com/rancher/os/config/cloudinit/datasource/metadata"
 )
@@ -72,6 +74,22 @@ func (ms MetadataService) FetchMetadata() (datasource.Metadata, error) {
 		SSHPublicKeys: nil,
 	}
 
+	addresses := []string{}
+	if public != nil {
+		addresses = append(addresses, public.String())
+	}
+	if local != nil {
+		addresses = append(addresses, local.String())
+	}
+	if len(addresses) > 0 {
+		network := netconf.InterfaceConfig{
+			Addresses: addresses,
+		}
+
+		md.NetworkConfig.Interfaces = make(map[string]netconf.InterfaceConfig)
+		md.NetworkConfig.Interfaces["eth0"] = network
+	}
+
 	keyStrings := strings.Split(projectSSHKeys+"\n"+instanceSSHKeys, "\n")
 
 	i := 0