unskip network qos rule type functional test

with the SDK at 0.9.12 the below test fails with:

'minimum_bandwidth' not in

+-----------------+
| Type            |
+-----------------+
| dscp_marking    |
| bandwidth_limit |
+-----------------+

So remove 'minimum_bandwidth' from the asserted fields.

Change-Id: I24ff691ae5a946d901afa763973305025829280b
Closes-Bug: 1653137

Author: stevemar

openstackclient/tests/functional/network/v2/test_network_qos_rule_type.py

@@ -13,19 +13,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import testtools
-
 from openstackclient.tests.functional import base
 
 
 class NetworkQosRuleTypeTests(base.TestCase):
     """Functional tests for Network QoS rule type. """
 
     AVAILABLE_RULE_TYPES = ['dscp_marking',
-                            'bandwidth_limit',
-                            'minimum_bandwidth']
+                            'bandwidth_limit']
 
-    @testtools.skip('broken SDK testing')
     def test_qos_rule_type_list(self):
         raw_output = self.openstack('network qos rule type list')
         for rule_type in self.AVAILABLE_RULE_TYPES: