don't use net.IPMask

net.IPMask doesn't have any advantages, as it would
marshalled to
mask:
  - 1
  - 2
  - 3
  - 4

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/node/methods.go

@@ -150,7 +150,6 @@ func recursiveFlatten(obj interface{}) (hasContent bool) {
 			for mapIter.Next() {
 				if mapIter.Value().Kind() == reflect.String {
 					if mapIter.Value().String() != "" {
-						// fmt.Println("map")
 						hasContent = true
 					}
 				} else {
@@ -203,12 +202,6 @@ func recursiveFlatten(obj interface{}) (hasContent bool) {
 				if len(val) != 0 && !val.IsUnspecified() {
 					hasContent = true
 				}
-			case reflect.TypeOf(net.IPMask{}):
-				val := valObj.Elem().Field(i).Interface().(net.IPMask)
-				if len(val) != 0 {
-					// fmt.Println("Mask")
-					hasContent = true
-				}
 			default:
 			}
 		}
@@ -346,3 +339,18 @@ func cleanList(list []string) (ret []string) {
 	}
 	return ret
 }
+
+/*
+Return the ipv4 address and mask in CIDR format. Aimed for the use in
+templates.
+*/
+func (netdev *NetDevs) IpCIDR() string {
+	if netdev.Ipaddr.IsUnspecified() || netdev.Netmask.IsUnspecified() {
+		return ""
+	}
+	ipCIDR := net.IPNet{
+		IP:   netdev.Ipaddr,
+		Mask: net.IPMask(netdev.Netmask),
+	}
+	return ipCIDR.String()
+}