Fix http.client.RemoteDisconnected errors

[rhuddleston]

With this commit 4 years ago OSError was caught:

889c5a7

Looks like there wasn't a good reason to include it give the comment. Also now with python 3 http.client.RemoteDisconnected is getting caught by OSError.

I see @fviard tried to make a fix for RemoteDisconnected here:

b4f1424

but the problem persisted until I removed these lines. There may be other places in the code that have the same issue but this fixed my specific issues with recv_file():

  File "/usr/bin/s3cmd", line 1316, in _download
    response = s3.object_get(uri, dst_stream, dst_file, extra_label = seq_label)
            http_response = conn.c.getresponse()
  File "/usr/lib/python3/dist-packages/S3/S3.py", line 715, in object_get
    response = self.recv_file(request, stream, labels, start_position)
  File "/usr/lib/python3/dist-packages/S3/S3.py", line 1612, in recv_file
    http_response = conn.c.getresponse()
  File "/usr/lib/python3.6/http/client.py", line 1331, in getresponse
    response.begin()
  File "/usr/lib/python3/dist-packages/S3/Custom_httplib3x.py", line 53, in httpresponse_patched_begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.6/http/client.py", line 266, in _read_status
    raise RemoteDisconnected("Remote end closed connection without"
http.client.RemoteDisconnected: Remote end closed connection without response```

I deployed this fix and verified it fixed the errors across our servers.

[rhuddleston]

@fviard What do you think, can we merge this? Also maybe it's time for a 2.0.3 release :)

[nadiahpk]

@rhuddleston Thank you! I only started having the problem this week for some reason, and I couldn't figure it out. But this fixed my problem.

[rogierslag]

Would be awesome to get this to a stable release :)

[fviard]

Finally merged, thanks for the investigation and the fix!

[jkroepke]

Nice, when we can expect a stable release?

[fviard]

@jkroepke In the coming days.

[fviard]

Fyi, the new release v2.1.0 is out and available in github and in Pypi.