libnetwork/netutils: remove dead code

- GetIfaceAddr is unused since moby/libnetwork@e51ead59
  (moby/libnetwork#670).
- ValidateAlias and ParseAlias are unused since moby/moby@0645eb84
  (moby/moby#42539).

Signed-off-by: Albin Kerouanton <albinker@gmail.com>

libnetwork/netutils/utils.go

@@ -62,35 +62,6 @@ func NetworkRange(network *net.IPNet) (net.IP, net.IP) {
 	return firstIP, lastIP
 }
 
-// GetIfaceAddr returns the first IPv4 address and slice of IPv6 addresses for the specified network interface
-func GetIfaceAddr(name string) (net.Addr, []net.Addr, error) {
-	iface, err := net.InterfaceByName(name)
-	if err != nil {
-		return nil, nil, err
-	}
-	addrs, err := iface.Addrs()
-	if err != nil {
-		return nil, nil, err
-	}
-	var addrs4, addrs6 []net.Addr
-	for _, addr := range addrs {
-		ip := (addr.(*net.IPNet)).IP
-		if ip4 := ip.To4(); ip4 != nil {
-			addrs4 = append(addrs4, addr)
-		} else if ip6 := ip.To16(); len(ip6) == net.IPv6len {
-			addrs6 = append(addrs6, addr)
-		}
-	}
-	switch {
-	case len(addrs4) == 0:
-		return nil, nil, fmt.Errorf("interface %v has no IPv4 addresses", name)
-	case len(addrs4) > 1:
-		fmt.Printf("Interface %v has more than 1 IPv4 address. Defaulting to using %v\n",
-			name, (addrs4[0].(*net.IPNet)).IP)
-	}
-	return addrs4[0], addrs6, nil
-}
-
 func genMAC(ip net.IP) net.HardwareAddr {
 	hw := make(net.HardwareAddr, 6)
 	// The first byte of the MAC address has to comply with these rules:
@@ -173,26 +144,3 @@ func ReverseIP(IP string) string {
 
 	return strings.Join(reverseIP, ".")
 }
-
-// ParseAlias parses and validates the specified string as an alias format (name:alias)
-func ParseAlias(val string) (string, string, error) {
-	if val == "" {
-		return "", "", errors.New("empty string specified for alias")
-	}
-	arr := strings.SplitN(val, ":", 3)
-	if len(arr) > 2 {
-		return "", "", errors.New("bad format for alias: " + val)
-	}
-	if len(arr) == 1 {
-		return val, val, nil
-	}
-	return arr[0], arr[1], nil
-}
-
-// ValidateAlias validates that the specified string has a valid alias format (containerName:alias).
-func ValidateAlias(val string) (string, error) {
-	if _, _, err := ParseAlias(val); err != nil {
-		return val, err
-	}
-	return val, nil
-}