cmd/cli: extend list of valid interfaces for MacOS

By parsing "networksetup -listallhardwareports" output to get list of
available hardware ports.

cmd/cli/net_others.go

@@ -6,4 +6,6 @@ import "net"
 
 func patchNetIfaceName(iface *net.Interface) error { return nil }
 
-func validInterface(iface *net.Interface) bool { return true }
+func validInterface(iface *net.Interface, validIfacesMap map[string]struct{}) bool { return true }
+
+func validInterfacesMap() map[string]struct{} { return nil }