Bugfix: Use 'wsdl' name for service url to WSDL file.

Using the old 'url' name is incompatible because we're looking for a
different response from the url. Use a new 'wsdl' config parameter
instead.

Change-Id: I3ec81e3b3889e17a31b0266a8887e2f564d23baf
Merge "Bugfix: Use 'wsdl' name for service url to WSDL file."