incorrect format type in BigSwitch plugin log line

[Kevin Benton]

The BigSwitch plugin incorrectly tries to log the response code it gets from an HTTP request as an integer when it should be a string, resulting in these errors in the output:
Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/__init__.py", line 846, in emit
    msg = self.format(record)
  File "/opt/stack/neutron/neutron/openstack/common/log.py", line 552, in format
    return logging.StreamHandler.format(self, record)
  File "/usr/lib/python2.7/logging/__init__.py", line 723, in format
    return fmt.format(record)
  File "/opt/stack/neutron/neutron/openstack/common/log.py", line 516, in format
    return logging.Formatter.format(self, record)
  File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
    record.message = record.getMessage()
  File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
    msg = msg % self.args
TypeError: %d format: a number is required, not str
Logged from file plugin.py, line 339

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/45006

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/45006
Committed: http://github.com/openstack/neutron/commit/d6f50e8476feb3c76db485fa033d0b1c22ee024d
Submitter: Jenkins
Branch: master

commit d6f50e8476feb3c76db485fa033d0b1c22ee024d
Author: Kevin Benton <email address hidden>
Date: Thu Aug 29 15:16:00 2013 -0700

    Fixes formatting exception from logging in BigSwitch plugin

    Corrects the data type expected for the HTTP code that comes
    back from the back-end controller in a debug log call.

    Closes-Bug: #1220521
    Change-Id: Ic71b24c724222ade5e695addf291c6488d665da9