py.bench: Don't forget to clear config's inicache after tweaking config.inicfg
If py.test machinery access any of the keys we change before we tweak them - their values will be put to config._inicache and our tweaking won't essentially have the effect. It used to be working without explicit cache invalidation with older pytests, but as of e.g. py.test 3.2.1 it does not work without explicit cache clearing because e.g. 'python_files' is somehow accessed before and is set to std 'test_*.py' + friends in the cache and this way py.bench then does not collect benchmarks from bench_*.py files. Fix it by making sure inicache is invalidated after our inicfg tweak.
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