scanner integration test fails some times because the test Web server is not multi-threaded
Because the Python Web server used for the integration tests is not multi-threaded, some relays' circuits timeout.
Most of the cases, this is desired since in a public network this would happen too.
It is not desired in the case that the integration test check for a concrete relay measurement success, which is
This case can be solved by checking the descriptor bandwidth, not the measurement.
Ideally, the Python Web server should be changed to be multi-threaded and shutting down some relays for the cases where the tests check failures.