Increase timeouts for OVSDB in functional tests

Increased timeouts for OVSDB connection:
  - ovsdb_timeout = 30

This patch will mitigate the intermittent timeouts the CI is
experiencing while running the functional tests.

Change-Id: I97a1d170926bb8a69dc6f7bb78a785bdea80936a
Closes-Bug: #1815142
(cherry picked from commit 30e901242f)

neutron/tests/functional/base.py

@@ -15,10 +15,12 @@
 
 import os
 
+import mock
 from oslo_config import cfg
 
 from neutron.agent.linux import utils
 from neutron.conf.agent import common as config
+from neutron.conf.agent import ovs_conf
 from neutron.tests import base
 from neutron.tests.common import base as common_base
 from neutron.tests.common import helpers
@@ -28,6 +30,14 @@ DEFAULT_LOG_DIR = os.path.join(helpers.get_test_log_path(),
                                'dsvm-functional-logs')
 
 
+def config_decorator(method_to_decorate, config_tuples):
+    def wrapper(*args, **kwargs):
+        method_to_decorate(*args, **kwargs)
+        for config_tuple in config_tuples:
+            cfg.CONF.set_override(*config_tuple)
+    return wrapper
+
+
 class BaseLoggingTestCase(base.BaseTestCase):
     def setUp(self):
         super(BaseLoggingTestCase, self).setUp()
@@ -62,6 +72,7 @@ class BaseSudoTestCase(BaseLoggingTestCase):
             self.skipTest('Testing with sudo is not enabled')
         self.setup_rootwrap()
         config.setup_privsep()
+        self._override_default_config()
 
     @common_base.no_skip_on_missing_deps
     def check_command(self, cmd, error_text, skip_msg, run_as_root=False):
@@ -71,3 +82,13 @@ class BaseSudoTestCase(BaseLoggingTestCase):
             if error_text in str(e):
                 self.skipTest(skip_msg)
             raise
+
+    @staticmethod
+    def _override_default_config():
+        # NOTE(ralonsoh): once https://review.openstack.org/#/c/641681/ is
+        # merged, we should increase the default value of those new parameters.
+        ovs_agent_opts = [('ovsdb_timeout', 30, 'OVS')]
+        ovs_agent_decorator = config_decorator(
+            ovs_conf.register_ovs_agent_opts, ovs_agent_opts)
+        mock.patch.object(ovs_conf, 'register_ovs_agent_opts',
+                          new=ovs_agent_decorator).start()

neutron/tests/unit/tests/functional/test_base.py

@@ -0,0 +1,59 @@
+# Copyright 2019 Red Hat, Inc.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import mock
+from oslo_config import cfg
+
+from neutron.tests import base
+from neutron.tests.functional import base as functional_base
+
+
+NEW_CONFIG_GROUP = cfg.OptGroup('testgroup',
+                                title='Test wrapping cfg register')
+SOME_OPTIONS = [
+    cfg.StrOpt('str_opt', default='default_value'),
+    cfg.StrOpt('int_opt', default=1),
+    cfg.BoolOpt('bool_opt', default=True)
+]
+
+
+def register_some_options(cfg=cfg.CONF):
+    cfg.register_opts(SOME_OPTIONS, 'testgroup')
+
+
+class ConfigDecoratorTestCase(base.BaseTestCase):
+
+    def setUp(self):
+        super(ConfigDecoratorTestCase, self).setUp()
+        cfg.CONF.register_group(NEW_CONFIG_GROUP)
+
+    def test_no_config_decorator(self):
+        register_some_options()
+        self.assertEqual('default_value', cfg.CONF.testgroup.str_opt)
+        self.assertEqual('1', cfg.CONF.testgroup.int_opt)
+        self.assertTrue(cfg.CONF.testgroup.bool_opt)
+
+    def test_override_variables(self):
+        opts = [('str_opt', 'another_value', 'testgroup'),
+                ('int_opt', 123, 'testgroup'),
+                ('bool_opt', False, 'testgroup')]
+        cfg_decorator = functional_base.config_decorator(register_some_options,
+                                                         opts)
+        mock.patch('neutron.tests.unit.tests.functional.test_base.'
+                   'register_some_options', new=cfg_decorator).start()
+        register_some_options()
+        self.assertEqual('another_value', cfg.CONF.testgroup.str_opt)
+        self.assertEqual('123', cfg.CONF.testgroup.int_opt)
+        self.assertFalse(cfg.CONF.testgroup.bool_opt)