Able to restart kernel after it dies

[DonJayamanne]

Refs: #7167

• anyOS @IanMatthewHuff

Complexity: 3

[Create Issue](https://github.com/microsoft/vscode-jupyter/issues/new?body=Testing+%23 7167%0A%0A&assignees=DonJayamanne)

Create Issue

---

Testing

• Install Python
• Install Python & Jupyter extension
• Open VS Code Insiders
• Create a python cell with the following code and run it

print("Hello World")

• Confirm cell runs (output should be displayed)
• Create another cell with the following cell & run it (this will kill the kernel)

import IPython  
app = IPython.Application.instance()  
app.kernel.do_shutdown(True) 

• Go back to the first cell & try to run that.
  • Confirm it fails with errors
• Restart the kernel using the toolbar or the command Notebook: Restart Kernel command
• Go back to the first cell & try to run that.
  • Confirm it runs successfully & output is displayed

[IanMatthewHuff]

Yup, scenario looks good.