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phabricator: use urllib3 to handle conduit HTTP

Description

phabricator: use urllib3 to handle conduit HTTP

urlgrabber is not available on Windows machines; urllib3 is MIT licensed so can
safely be bundled.

Test Plan:
Run the tests, run hg ssl against a repository with valid arcanist config.

Differential Revision: https://phab.mercurial-scm.org/D1026