trunk: Create vxlan network when testing inherit

The inherit segmentation type fails only when parent network has a not
supported network type. In case default is a supported one, e.g. vlan,
then inherit correctly returns vlan as subport segmentation type.

This patch forces to use vxlan as a network type for test validating
inherit option.

Cherry-picked from change Idf6935e4da426ff50457483a8f08a9ae3e403f75
from neutron_tempest_plugin

Change-Id: Idf6935e4da426ff50457483a8f08a9ae3e403f75
Closes-bug: #1739227

neutron/tests/tempest/api/test_trunk.py

@@ -54,8 +54,20 @@ class TrunkTestJSONBase(base.BaseAdminNetworkTest):
         trunks_cleanup(cls.client, cls.trunks)
         super(TrunkTestJSONBase, cls).resource_cleanup()
 
-    def _create_trunk_with_network_and_parent(self, subports, **kwargs):
-        network = self.create_network()
+    @classmethod
+    def is_type_driver_enabled(cls, type_driver):
+        return (type_driver in
+                config.CONF.neutron_plugin_options.available_type_drivers)
+
+    def _create_trunk_with_network_and_parent(
+            self, subports, parent_network_type=None, **kwargs):
+        client = None
+        network_kwargs = {}
+        if parent_network_type:
+            client = self.admin_client
+            network_kwargs = {"provider:network_type": parent_network_type,
+                              "tenant_id": self.client.tenant_id}
+        network = self.create_network(client=client, **network_kwargs)
         parent_port = self.create_port(network)
         trunk = self.client.create_trunk(parent_port['id'], subports, **kwargs)
         self.trunks.append(trunk['trunk'])
@@ -266,9 +278,7 @@ class TrunkTestMtusJSONBase(TrunkTestJSONBase):
     @classmethod
     def skip_checks(cls):
         super(TrunkTestMtusJSONBase, cls).skip_checks()
-        if any(t
-               not in config.CONF.neutron_plugin_options.available_type_drivers
-               for t in ['gre', 'vxlan']):
+        if not all(cls.is_type_driver_enabled(t) for t in ['gre', 'vxlan']):
             msg = "Either vxlan or gre type driver not enabled."
             raise cls.skipException(msg)
 

neutron/tests/tempest/api/test_trunk_negative.py

@@ -13,6 +13,7 @@
 #    under the License.
 
 from oslo_utils import uuidutils
+from tempest.common import utils
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 import testtools
@@ -103,8 +104,14 @@ class TrunkTestJSON(test_trunk.TrunkTestJSONBase):
 
     @decorators.attr(type='negative')
     @decorators.idempotent_id('40aed9be-e976-47d0-dada-bde2c7e74e57')
+    @utils.requires_ext(extension="provider", service="network")
     def test_create_subport_invalid_inherit_network_segmentation_type(self):
-        trunk = self._create_trunk_with_network_and_parent([])
+        if not self.is_type_driver_enabled('vxlan'):
+            msg = "Vxlan type driver must be enabled for this test."
+            raise self.skipException(msg)
+
+        trunk = self._create_trunk_with_network_and_parent(
+            subports=[], parent_network_type='vxlan')
         subport_network = self.create_network()
         parent_port = self.create_port(subport_network)
         self.assertRaises(lib_exc.BadRequest, self.client.add_subports,