[MRG] Prototype 3 for strict check_estimator mode#17252

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NicolasHug wants to merge 6 commits intoscikit-learn:masterfrom

NicolasHug:strict_mode_using_xfails_tag

Commits on May 16, 2020

treat strict checks as xfail checks
NicolasHug
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Commits on May 19, 2020

Commits on May 20, 2020