Filter endpoints in service catalog by type

When I originally added support for using Keystone for authenticating to
Craton, I made a mistake in setting a keyword argument of
"service_type". The correct way to use keystoneauth1 to filter the
endpoint by service type is to specify an endpoint filter dictionary
that specifies the service_type as "fleet_management"

Change-Id: I6dcdde351d5e2051105df904b2d936abafbcc231

cratonclient/session.py

@@ -199,13 +199,14 @@ class Session(object):
     def _request(self, **kwargs):
         """Make a request and optionally remove the Keystone parameters."""
         # Default the Keystone specific arguments
-        kwargs.setdefault('service_type', 'fleet_management')
+        kwargs.setdefault('endpoint_filter',
+                          {'service_type': 'fleet_management'})
         try:
             response = self._session.request(**kwargs)
         except TypeError:
             # If we're using a Session object that doesn't support Keystone
             # parameters, we need to remove them and retry.
-            kwargs.pop('service_type')
+            kwargs.pop('endpoint_filter')
             response = self._session.request(**kwargs)
         return response