Add compat with pytest-capturelog for note()-style logging capture?

[Daenyth]

Using hypothesis with code that has logging statements makes it very difficult to use those log calls to debug.

Having the ability to have logging output captured in the style of note() would be extremely useful. The pytest-capturelog plugin collects the logging output into the test failure message. It would be really nice to have some kind of cross-compatibility with them so that it can group captured logs by example rather than at the test-function level

[Zac-HD]

As of pytest 3.3, log capturing is built in - meaning that logs are probably being captured (for all examples, eek) more often, and there's a standard thing that we can be compatible with in the pytest plugin (in hypothesis.extra)

See https://docs.pytest.org/en/latest/logging.html

[Zac-HD]

This may be as simple as disabling logging for all but the final example of a test, which can be done in hypothesis.control.BuildContext:

if not self.is_final:  # in __enter__
    logging.disable()
...
if not self.is_final:  # in __exit__
    logging.disable(logging.NOTSET)

and adding a test in tests/pytest/ that a test with a log statement only logs it once.