add exclude path option in ListDir

[edonyzpc]

def _listdir(self, path=None, excludepath=None):
        """ list root path recursively including sub-directories
        """
        if self.root is None:
            if path is not None:
                for root_, dir_, file_ in os.walk(path):
                    if root_ == excludepath:
                        continue
                    dir_ctx = []
                    dir_ctx.insert(0, file_)
                    dir_ctx.insert(0, dir_)
                    buf_dl = {}
                    buf_dl[root_] = dir_ctx
                    self._dl_buf.insert(0, buf_dl)
            else:
                raise Exception("Error DirList class initialize")
        else:
            for root_, dir_, file_ in os.walk(self.root):
                if root_ == excludepath:
                    continue
                dir_ctx = []
                dir_ctx.insert(0, file_)
                dir_ctx.insert(0, dir_)
                self.dirlist[root_] = dir_ctx

[edonyzpc]

finished 811acb3