Respect passed arguments for Neutron client connection

At the moment quite vital arguments, such as region_name and
valid_interfaces, are ignored by the plugin, which results in
inconsistent behaviour with Octavia when trying to interact with
Neutron.

For instance, while Octavia connects to Neutron through the internal
endpoint, the plugin still tries to reach it through the public one,
ignoring options defined in [service_auth] and [neutron] sections.

This patch is basically a copy-paste from Octavia [1].

[1] https://review.opendev.org/c/openstack/octavia/+/905794

Closes-Bug: #2110488
Related-Bug: #2049551

Change-Id: I3a98825e40143dfa9017ca512a27197c48c31ee9
(cherry picked from commit 7a17cd1ae3)

ovn_octavia_provider/common/clients.py

@@ -118,11 +118,19 @@ class NeutronAuth(metaclass=Singleton):
         try:
             ksession = KeystoneSession('neutron')
 
-            kwargs = {}
+            kwargs = {'region_name': CONF.neutron.region_name}
+            try:
+                interface = CONF.neutron.valid_interfaces[0]
+            except (TypeError, LookupError):
+                interface = CONF.neutron.valid_interfaces
+            if interface:
+                kwargs['interface'] = interface
             if CONF.neutron.endpoint_override:
                 kwargs['network_endpoint_override'] = (
                     CONF.neutron.endpoint_override)
-
+                if CONF.neutron.endpoint_override.startswith("https"):
+                    kwargs['insecure'] = CONF.neutron.insecure
+                    kwargs['cacert'] = CONF.neutron.cafile
             self.network_proxy = openstack.connection.Connection(
                 session=ksession.session, **kwargs).network
         except Exception:

ovn_octavia_provider/tests/unit/common/test_clients.py

@@ -99,6 +99,9 @@ class TestNeutronAuth(base.BaseTestCase):
     def setUp(self):
         super().setUp()
         config.register_opts()
+        self.conf = self.useFixture(oslo_fixture.Config(cfg.CONF))
+        self.conf.config(group='neutron', region_name='RegionOne',
+                         valid_interfaces='internal')
         self.mock_client = mock.patch(
             'openstack.connection.Connection').start()
         clients.Singleton._instances = {}
@@ -107,7 +110,8 @@ class TestNeutronAuth(base.BaseTestCase):
     def test_init(self, mock_ks):
         clients.NeutronAuth()
         self.mock_client.assert_called_once_with(
-            session=mock_ks().session)
+            session=mock_ks().session, interface='internal',
+            region_name='RegionOne')
 
     def test_singleton(self):
         c1 = clients.NeutronAuth()
@@ -133,7 +137,8 @@ class TestNeutronAuth(base.BaseTestCase):
     def test_get_client(self, mock_ks):
         clients.get_neutron_client()
         self.mock_client.assert_called_once_with(
-            session=mock_ks().session)
+            session=mock_ks().session, interface='internal',
+            region_name='RegionOne')
 
     @mock.patch.object(clients, 'NeutronAuth', side_effect=[RuntimeError])
     def test_get_client_error(self, mock_ks):

releasenotes/notes/add-neutron-client-interface-info-6a018cad49b5d240.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    [`bug 2110488 <https://bugs.launchpad.net/neutron/+bug/2110488>`_]
+    Fixed wrong endpoint information in Neutron client configuration.