Update 'requests' lib to v2.0.

New version has a bunch of relevant fixes:
  * Timeouts now apply to read time if stream=False.
  * Chunked encoding fixes.
  * Better handling of streaming downloads.
  * Improved streaming behaviour, particularly for compressed data.

It looks like Session object in new version copies cookie jar rather than holds
reference to it. Thus new RequestEngine.reload_cookies method that is
called whenever auth related cookies are added to original cookie jar.

BUG=
R=maruel@chromium.org

Review URL: https://codereview.chromium.org/25004007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/swarm_client@226291 0039d316-1c4b-4281-b951-d872f2087c98
58 files changed