html: fix SOLIDUS '/' handling in attribute parsing

[maciekmm]

Calling the Tokenizer with HTML elements containing SOLIDUS (/) character
in the attribute name results in incorrect tokenization.

This is due to violation of the following rule transitions in the WHATWG spec:

• https://html.spec.whatwg.org/multipage/parsing.html#attribute-name-state,
  where we are not reconsuming the character if '/' is encountered
• https://html.spec.whatwg.org/multipage/parsing.html#after-attribute-name-state,
  where we are not switching to self closing state

Fixes golang/go#63402

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Patch Set 3:

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Patch Set 3: Code-Review+2 Commit-Queue+1

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Patch Set 3:

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Patch Set 3: -Commit-Queue

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This PR is being closed because golang.org/cl/533518 has been merged.