Turn vendored Node.js' http-parser into a git submodule

[webknjaz]

What do these changes do?

Replace a copy-pasted http-parser contents with git-trackable submodule. I recall @asvetlov was encouraging to do this PR a while back.
Side-effect: also update vendored lib to currently latest version.

Are there changes in behavior for the user?

Only for devs, they might want to use --recurse-submodules when doing git clone

Related issue number

‒

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[asvetlov]

Documentation should be updated to reflect the fact that bare git clone doesn't work anymore.

[asvetlov]

http-parser is a C library, not python package.

fixed

[codecov-io]

Codecov Report

Merging #3011 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3011   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files          42       42           
  Lines        7707     7707           
  Branches     1344     1344           
=======================================
  Hits         7560     7560           
  Misses         51       51           
  Partials       96       96

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[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new