[MS][Dataset]debugger train and ctrl+c cann't terminate process.

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| ---------- | ------------------------------------- | -------- |
| Bug Report | Use this template for reporting a bug | kind/bug |

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## Environment
- **Hardware Environment(`Ascend`/`GPU`/`CPU`)**: 
> Uncomment only one ` /device <>` line, hit enter to put that in a new line, and remove leading whitespaces from that line:
>
> /device ascend

- **Software Environment**:
-- MindSpore version (source or binary):master 1.1.0.20201214 git version: [sha1]:e4d675b, [branch]: (HEAD -> master, origin/master, origin/HEAD)
-- Python version (e.g., Python 3.7.5):Python 3.7.5
-- OS platform and distribution (e.g., Linux Ubuntu 16.04):
-- GCC/Compiler version (if compiled from source):

## Related testcase

## Steps to reproduce the issue
1. start MI --enable-debugger=True and open UI to visualize the trainning process.
2. ctrl + c cann't terminate the trainning process.

## Describe the current behavior
ctrl + c cann't terminate the trainning process.

## Describe the expected behavior
ctrl + c can terminate the trainning process.

## Related log / screenshot

## Special notes for this issue
使用debugger调试训练，想要重新开始无法结束训练。

GVP MindSpore/mindspore

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GVPMindSpore/mindspore

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