Remove Input autoComplete restriction to allow more complex auto-filling behaviour

[delesseps]

As well as on and off there are many other possible values such as email, username, new-password, current-password and credit card options to help the browser autofill.

References

• https://www.chromium.org/developers/design-documents/form-styles-that-chromium-understands
• https://developers.google.com/web/updates/2015/06/checkout-faster-with-autofill

[codecov]

Codecov Report

Merging #7699 into antd-3.0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           antd-3.0   #7699   +/-   ##
========================================
  Coverage      82.1%   82.1%           
========================================
  Files           214     214           
  Lines          4453    4453           
  Branches       1342    1342           
========================================
  Hits           3656    3656           
  Misses          797     797

Impacted Files	Coverage Δ
components/input/Input.tsx	87.93% <ø> (ø)	⬆️

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