ARROW-2691: [Rust] Update code formatting with latest Rust stable#2126

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andygrove wants to merge 16 commits intoapache:masterfrom

andygrove:fix_fmt

Commits on Apr 9, 2018

Commits on Apr 10, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on Apr 11, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on Apr 14, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on Apr 18, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on Apr 20, 2018

Commits on Apr 28, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on May 1, 2018

Merge branch 'master' of github.com:andygrove/arrow
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Commits on May 2, 2018

Merge branch 'master' of github.com:andygrove/arrow
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Commits on May 19, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on May 21, 2018

Merge remote-tracking branch 'upstream/master'
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Commits on Jun 9, 2018