Use buffering for HTTP responses on chunked requests
Use buffering for HTTP responses on chunked requests

For non-chunked requests, the request is performed using the 'urlopen'
method that underlying uses buffering for the HTTP responses (for Python
2.7+ versions). For chunked requests though, the request is made via a
different code path and so the 'getresponse' method is called without
using buffering. So, the response is consumed per single byte via a
recv() call on the underlying socket.

This patch, fixes that issue to mimic the non-chucked request behavior.

psf/requests