【paddle.fleet】 Usages Change: from fleet.util() to fleet.util

[123malin]

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修复fleet.util() -> fleet.util，当前util的使用示例为：

import paddle.distributed.fleet as fleet
fleet.init(is_collective=False)

files = fleet.util.get_file_shard(["file1", "file2", "file3"])
print(files)

自定义util的使用方法为：

import paddle.distributed.fleet as fleet

class UserDefinedUtil(fleet.UtilBase):
    def __init__(self):
        super(UserDefinedUtil, self).__init__()

    def get_user_id(self):
        return 10
fleet.init()
my_util = UserDefinedUtil()
fleet.util = my_util
user_id = fleet.util.get_user_id()
print(user_id)

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[guru4elephant]

LGTM

[seiriosPlus]

LGTM