[DNM] setup.cfs: use no-patch-threads branch of teuthology

[VallariAg]

Testing unit test fix by using teuthology with a new commit: VallariAg/teuthology@b7e20cb.

To understand the cause of problem...
I created a new file test_new:

from fastapi import FastAPI
from fastapi.testclient import TestClient

app = FastAPI()


@app.get("/")
async def read_main():
    return {"msg": "Hello World"}


client = TestClient(app)


def test_read_main():
    response = client.get("/")
    assert response.status_code == 200
    assert response.json() == {"msg": "Hello World"}

and ran pytest tests/test_new.py::test_read_main --full-trace
Then added import teuthology to the file and it starts hanging!

With --full-trace, I get a gevent traceback. Which means teuthology and TestClient are clashing somehow.
I've seen these gevent problems before with teuthology import. Not patching threads in teuthology fixed it.

So testing it again here.

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Checklist

• Changes tested in container setup
• Changes tested in non-containerized setup
• Includes tests
• Documentation updated