Make debugger gevent compatible

[DonJayamanne]

From @underyx on June 5, 2017 10:27

Environment data

VS Code version: 1.12.2
Python Extension version: 0.6.4
Python Version: 2.7.13
OS and version: macOS Sierra

Actual behavior

Running apps that use gevent/eventlet/greenlet/green threads/etc. with the debugger active causes the app to just freeze early on. This is the same behavior that I see when I run the same app with the PyCharm debugger with its 'Gevent compatible' switch turned off.

Expected behavior

They should work just like synchronous apps. In PyCharm, there's an option for this called 'Gevent compatible' on the debugger settings page, that sounds like a reasonable thing to have here as well.

Steps to reproduce:

1. Take any Python application.
2. pip install gevent.
3. Add from gevent import monkey; monkey.patch_all() in the app's __init__.py.
4. Try to run it with the debugger.

Settings

Your launch.json (if dealing with debugger issues):

        {
            "name": "my api",
            "type": "python",
            "request": "launch",
            "stopOnEntry": false,
            "pythonPath": "${config:python.pythonPath}",
            "program": "env/bin/gunicorn",
            "args": [
                "--config=.misc/gunicorn_config.py",
                "--reload",
                "myapi"
            ],
            "cwd": "${workspaceRoot}",
            "env": {},
            "envFile": "${workspaceRoot}/.env",
            "debugOptions": [
                "WaitOnAbnormalExit",
                "WaitOnNormalExit",
                "RedirectOutput"
            ]
        },
``

Your settings.json:   
```json
{
    "python.pythonPath": "env/bin/python"
}

Logs

Output from Python output panel

(empty)

Output from Console window (Help->Developer Tools menu)

(empty)

Edit: oh wow, 1000! 🎊

Copied from original issue: DonJayamanne/pythonVSCode#1000

[DonJayamanne]

From @m0ngr31 on June 12, 2017 15:56

+1. I thinking that is part of the problem with the issue I opened up.

[DonJayamanne]

From @underyx on June 12, 2017 16:36

Said issue: https://github.com/DonJayamanne/pythonVSCode/issues/985