Check if port exists in update_port_virtual_type method

During the OVN DB inconsistency check, a OVN LSP could not be present
in the Neutron DB. In this case, continue processing other LSPs and
let other ``DBInconsistenciesPeriodics`` methods to resolve this
issue.

Closes-Bug: #1999517

Conflicts:
    neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py

Change-Id: Ifb8bdccf6819f7f8af1abd3b82ccb1cd2e4c2fb8
(cherry picked from commit dfe6947)

Author: ralonsoh

neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py

@@ -827,7 +827,11 @@ def update_port_virtual_type(self):
             if lsp.type != '':
                 continue
 
-            port = self._ovn_client._plugin.get_port(context, lsp.name)
+            try:
+                port = self._ovn_client._plugin.get_port(context, lsp.name)
+            except n_exc.PortNotFound:
+                continue
+
             for ip in port.get('fixed_ips', []):
                 if utils.get_virtual_port_parents(
                         self._nb_idl, ip['ip_address'], port['network_id'],

neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py

@@ -30,6 +30,7 @@
 from neutron.tests.unit import fake_resources as fakes
 from neutron.tests.unit.plugins.ml2 import test_security_group as test_sg
 from neutron.tests.unit import testlib_api
+from neutron_lib import exceptions as n_exc
 
 
 class TestSchemaAwarePeriodicsBase(testlib_api.SqlTestCaseLight):
@@ -599,10 +600,13 @@ def test_update_port_virtual_type(self, *args):
             attrs={'name': 'lsp0', 'type': ''})
         lsp1 = fakes.FakeOvsdbRow.create_one_ovsdb_row(
             attrs={'name': 'lsp1', 'type': constants.LSP_TYPE_VIRTUAL})
+        lsp2 = fakes.FakeOvsdbRow.create_one_ovsdb_row(
+            attrs={'name': 'lsp2_not_present_in_neutron_db', 'type': ''})
         port0 = {'fixed_ips': [{'ip_address': mock.ANY}],
                  'network_id': mock.ANY, 'id': mock.ANY}
-        nb_idl.lsp_list.return_value.execute.return_value = (lsp0, lsp1)
-        self.fake_ovn_client._plugin.get_port.return_value = port0
+        nb_idl.lsp_list.return_value.execute.return_value = (lsp0, lsp1, lsp2)
+        self.fake_ovn_client._plugin.get_port.side_effect = [
+            port0, n_exc.PortNotFound(port_id=mock.ANY)]
 
         self.assertRaises(
             periodics.NeverAgain, self.periodic.update_port_virtual_type)