[Ci-users] jjb timeouts talking to Jenkins master

I'm seeing timeouts trying to run JJB:

```
INFO:jenkins_jobs.builder:Number of jobs generated:  21
INFO:jenkins_jobs.builder:Reconfiguring jenkins job atomic-duffy-allocate
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/jenkins_jobs/parallel.py", line 62, in run
    **task['kwargs'])
  File "/usr/lib/python2.7/site-packages/jenkins_jobs/builder.py", line 435, in parallel_update_job
    self.jenkins.update_job(job.name, job.output().decode('utf-8'))
  File "/usr/lib/python2.7/site-packages/jenkins_jobs/parallel.py", line 112, in parallelized
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/jenkins_jobs/builder.py", line 161, in update_job
    self.jenkins.reconfig_job(job_name, xml)
  File "/usr/lib/python2.7/site-packages/jenkins/__init__.py", line 1019, in reconfig_job
    DEFAULT_HEADERS))
  File "/usr/lib/python2.7/site-packages/jenkins/__init__.py", line 431, in jenkins_open
    response = urlopen(req, timeout=self.timeout).read()
  File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib64/python2.7/urllib2.py", line 437, in open
    response = meth(req, response)
  File "/usr/lib64/python2.7/urllib2.py", line 550, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python2.7/urllib2.py", line 475, in error
    return self._call_chain(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 558, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 504: Gateway Time-out
```

Is anyone else experiencing this?  Any useful log messages on the Jenkins server side?