[bgpvpn] Remove _create_port & create_keypair

As tempest.scenario.manager was announced stable interface in Tempest
27.0.0[1] it can be now reused in plugins.

Removed methods:
    * _create_port
    * create_keypair

Etherpad concerning this effort:
https://etherpad.opendev.org/p/tempest-scenario-manager-cleanup

[1] https://docs.openstack.org/releasenotes/tempest/v27.0.0.html#release-notes-27-0-0

Change-Id: Iec1b3d1d8655f20228cd98a49a39648c7bcf6a0a
diff --git a/neutron_tempest_plugin/bgpvpn/scenario/manager.py b/neutron_tempest_plugin/bgpvpn/scenario/manager.py
index f928e16..93d35bf 100644
--- a/neutron_tempest_plugin/bgpvpn/scenario/manager.py
+++ b/neutron_tempest_plugin/bgpvpn/scenario/manager.py
@@ -23,14 +23,14 @@
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
-import tempest.test
+from tempest.scenario import manager
 
 CONF = config.CONF
 
 LOG = log.getLogger(__name__)
 
 
-class ScenarioTest(tempest.test.BaseTestCase):
+class ScenarioTest(manager.NetworkScenarioTest):
     """Base class for scenario tests. Uses tempest own clients. """
 
     credentials = ['primary']
@@ -56,30 +56,6 @@
     # The create_[resource] functions only return body and discard the
     # resp part which is not used in scenario tests
 
-    def _create_port(self, network_id, client=None, namestart='port-quotatest',
-                     **kwargs):
-        if not client:
-            client = self.ports_client
-        name = data_utils.rand_name(namestart)
-        result = client.create_port(
-            name=name,
-            network_id=network_id,
-            **kwargs)
-        self.assertIsNotNone(result, 'Unable to allocate port')
-        port = result['port']
-        self.addCleanup(test_utils.call_and_ignore_notfound_exc,
-                        client.delete_port, port['id'])
-        return port
-
-    def create_keypair(self, client=None):
-        if not client:
-            client = self.keypairs_client
-        name = data_utils.rand_name(self.__class__.__name__)
-        # We don't need to create a keypair by pubkey in scenario
-        body = client.create_keypair(name=name)
-        self.addCleanup(client.delete_keypair, name)
-        return body['keypair']
-
     def get_remote_client(self, ip_address, username=None, private_key=None):
         """Get a SSH client to a remote server
 
diff --git a/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py b/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
index 14b0572..f7c9e72 100644
--- a/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
+++ b/neutron_tempest_plugin/bgpvpn/scenario/test_bgpvpn_basic.py
@@ -1181,9 +1181,12 @@
         create_port_body = {'fixed_ips': [{'ip_address': ip_address}],
                             'namestart': 'port-smoke',
                             'security_groups': security_groups}
-        port = self._create_port(network_id=network['id'],
-                                 client=clients.ports_client,
-                                 **create_port_body)
+
+        port = super(manager.NetworkScenarioTest,
+                    self).create_port(network_id=network['id'],
+                                    client=clients.ports_client,
+                                    **create_port_body)
+
         create_server_kwargs = {
             'key_name': keypair['name'],
             'networks': [{'uuid': network['id'], 'port': port['id']}]