[Pytest integration] Log the settings and profile name that are globally in effect (or make this easier for users)

[jab]

When I run my test suite using pytest, other pytest plugins in use such as pytest-benchmark helpfully log the settings that they have globally in effect:

platform darwin -- Python 3.6.5, pytest-3.5.0, py-1.5.3, pluggy-0.6.0 -- /usr/local/opt/python/bin/python3.6
cachedir: .pytest_cache
benchmark: 3.1.1 (defaults: timer=time.perf_counter disable_gc=False min_rounds=5 min_time=0.000005 max_time=1.0 calibration_precision=10 warmup=False warmup_iterations=100000)
...

Can Hypothesis do something similar, or at least make it easier for users to do this? Otherwise dealing with captured output in pytest can be tricky and annoying, and there's also no public API for querying for the currently-active profile (only the private hypothesis.settings._current_profile).

[Zac-HD]

Related to #1238.

[massey101]

Gonna take a look at this.