title: getPrivateNetworkVrfs" is not a valid method for this service
body: <p>We are trying to use the method <code>getPrivateNetworkVrfs()</code> found in the doc
  <a href="http://sldn.softlayer.com/reference/services/SoftLayer_Account" rel="nofollow noreferrer">http://sldn.softlayer.com/reference/services/SoftLayer_Account</a>. But we are getting error like</p>
  
  <pre><code>client.call('SoftLayer_Account', 'getPrivateNetworkVrfs')
  Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  File "/usr/local/lib/python2.7/site-packages/SoftLayer/API.py", line 237, in call
  return self.transport(request)
  File "/usr/local/lib/python2.7/site-packages/SoftLayer/transports.py", line 187, in __call__
  raise _ex(ex.faultCode, ex.faultString)
  SoftLayer.exceptions.SoftLayerAPIError: SoftLayerAPIError(Client): Function ("getPrivateNetworkVrfs") is not a valid method for this service.
  </code></pre>
  
  <p>But we are able to use method like "<code>getNetworkVlanSpan</code>" successfully</p>
  
  <p>Please let us know, whether we are missing anything here?</p>
  
  <p>Thanks</p>