def dir_name(name)
      name = name.dup
      name.gsub!(":", VAGRANT_COLON) if Util::Platform.windows?
      name.gsub!("/", VAGRANT_SLASH)
      name
    end
def dir_name(name)
      name = name.dup
      name.gsub!(":", VAGRANT_COLON) if Util::Platform.windows?
      name.gsub!("/", VAGRANT_SLASH)
      name
    end
Returns the directory name for the box of the given name.

 @param [String] name
 @return [String]