Embed the code from the negotiate package in the sources

so that we do have to manage yet another dependecy; the code is small and has not been modified for years.

Also move API related code in an swh.core.api package

closes #1499 (closed)

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Migrated from D1018 (view on Phabricator)

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swh/core/api_async.py is used by the vault.

swh/core/api_async.py is used by the vault.

yes, and it will still work with the change here.

yes, and it will still work with the change here.

Oh, I missed the new import *. Nevermind then.

Insert the MIT license in the negotiate.py file

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Should be in negotiate.py (it makes sense logically, and it will get the required copyright notice.)