change the FolderStorage key

updating the key will cause the FolderStorage hash to change forcing
modules to be re-fetched. This is required because any configurations
using the subDir notation will have the configuration in the wrong
directory.

config/module/tree.go

@@ -182,7 +182,7 @@ func (t *Tree) Load(s getter.Storage, mode GetMode) error {
 		}
 		// Get the directory where this module is so we can load it
 		key := strings.Join(path, ".")
-		key = fmt.Sprintf("root.%s-%s", key, m.Source)
+		key = fmt.Sprintf("module.%s-%s", key, m.Source)
 
 		dir, ok, err := getStorage(s, key, source, mode)
 		if err != nil {