[WIP] Testing out forked changes for PR 4142 at rustfmt upstream#1

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bradleypmartin wants to merge 3 commits intomasterfrom test-recursive-mode-past

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Commits on Apr 27, 2020

add recursive mode and clean up whitelist where we can
bradleypmartin
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Commits on Apr 28, 2020

move recursive setting to top of lib.rs files
bradleypmartin
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rustfmt-core/rustfmt-lib/src/test/mod.rs : revert skipped files
bradleypmartin
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