Set the local file objects from the file server interface

def __setup_fileserver(self):
        '''
        Set the local file objects from the file server interface
        '''
        fs_ = salt.fileserver.Fileserver(self.opts)
        self._serve_file = fs_.serve_file
        self._file_find = fs_._find_file
        self._file_hash = fs_.file_hash
        self._file_list = fs_.file_list
        self._file_list_emptydirs = fs_.file_list_emptydirs
        self._dir_list = fs_.dir_list
        self._symlink_list = fs_.symlink_list
        self._file_envs = fs_.envs