Set the local file objects from the file server interface

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