clamdad

See #2156 for a simple example that reproduces the error on Windows. The example only fails if [pytest live logs](https://docs.pytest.org/en/6.2.x/logging.html#live-logs) is enabled.

> I was actually looking for the same feature. Basically like `pyethapp` was providing: https://github.com/ethereum/pyethapp/blob/v1.5.0/pyethapp/accounts.py#L26 > > My use case is, I want to play with "read-only" accounts without providing...