botocore API missmatch with python3-requests

[Tully]

The upstream package integrates a newer version of the requests python library. In the debian package it is modified to use the debian packages python3-requests. However it's not modified to use the older requests API fully.

At least the bucket.upload_file method is broken in the debian packaging. I ticketed it upstream https://github.com/boto/botocore/issues/1266 but since it's a packaging issue I'm refiling it here.

Here's my script failing with the call to requests.

```
$ python3 run_test.py
Uploading results for test: test_upload_20170817142448 from /tmp/output
Uploading /tmp/output/ros.bag to test_upload_20170817142448/ros.bag
Uploading /tmp/output/gazebo.log to test_upload_20170817142448/gazebo.log
Traceback (most recent call last):
  File "run_test.py", line 47, in <module>
    upload_to_s3(b, test_name, results_dir)
  File "run_test.py", line 14, in upload_to_s3
    bucket.upload_file(full_f, bucket_key)
  File "/usr/lib/python3/dist-packages/boto3/s3/inject.py", line 110, in bucket_upload_file
    ExtraArgs=ExtraArgs, Callback=Callback, Config=Config)
  File "/usr/lib/python3/dist-packages/boto3/s3/inject.py", line 71, in upload_file
    extra_args=ExtraArgs, callback=Callback)
  File "/usr/lib/python3/dist-packages/boto3/s3/transfer.py", line 629, in upload_file
    self._put_object(filename, bucket, key, callback, extra_args)
  File "/usr/lib/python3/dist-packages/boto3/s3/transfer.py", line 639, in _put_object
    **extra_args)
  File "/usr/lib/python3/dist-packages/botocore/client.py", line 251, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/usr/lib/python3/dist-packages/botocore/client.py", line 526, in _make_api_call
    operation_model, request_dict)
  File "/usr/lib/python3/dist-packages/botocore/endpoint.py", line 141, in make_request
    return self._send_request(request_dict, operation_model)
  File "/usr/lib/python3/dist-packages/botocore/endpoint.py", line 166, in _send_request
    request = self.create_request(request_dict, operation_model)
  File "/usr/lib/python3/dist-packages/botocore/endpoint.py", line 151, in create_request
    prepared_request = self.prepare_request(request)
  File "/usr/lib/python3/dist-packages/botocore/endpoint.py", line 162, in prepare_request
    return request.prepare()
  File "/usr/lib/python3/dist-packages/botocore/awsrequest.py", line 369, in prepare
    p.prepare_body(self.data, self.files)
  File "/usr/lib/python3/dist-packages/botocore/awsrequest.py", line 440, in prepare_body
    data.seek(0, 2)
TypeError: seek() takes 2 positional arguments but 3 were given
```

I have a local workaround that doesn't call `upload_file` but just calls `put_object` instead that avoids the problem.
```
            print('Uploading %s to %s' % (full_f, bucket_key))
            if os.stat(full_f).st_size:
                bucket.upload_file(full_f, bucket_key)
            else:
                print("Empty file fallback behavior")
                bucket.put_object(
                    Key=bucket_key,
                    Body=''
                )
```

And here's it passing with the workaround above.
```
$ python3 run_test.py
Uploading results for test: test_upload_20170817144559 from /tmp/output
Uploading /tmp/output/ros.bag to test_upload_20170817144559/ros.bag
Uploading /tmp/output/gazebo.log to test_upload_20170817144559/gazebo.log
Empty file fallback behavior
Uploading /tmp/output/test_results/results1.xml to test_upload_20170817144559/results1.xml
Empty file fallback behavior
Uploading /tmp/output/test_results/results2.xml to test_upload_20170817144559/results2.xml
Empty file fallback behavior
```

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.