Uncovered lines

[Peque]

This exception handling in osbrain/proxy.py is not always covered by the test suite:

class Proxy():
    def shutdown(self, timeout=10.):
        # ...
        except ConnectionClosedError:
            pass

We should create a test that forces a ConnnectionClosedError on shutdown.

[Peque]

Worst thing is not that those lines are not covered, but that they are randomly covered by our test suite. This can lead to unwanted failing coverage reports.