Don't run some of the stateless SG tests in ovn migration workflow

This commit adds new pytest mark "skip_during_ovn_migration" to mark
some tests to be always skipped during migration from ML2/OVS to
ML2/OVN and marks as such tests from the
StatelessSecurityGroupInstanceTest class.

The reason why those tests shouldn't be run during the ovs to ovn
migration is that we are skipping them in ML2/OVS env so resources
required by those tests aren't created and later, when env is ML2/OVN
already we can't really verify them as we don't have required resources
created.

This patch modifies also ovn_migration tox env so it will run all
neutron scenario tests EXCEPT tests marked with this new pytest mark as
"skip_during_ovn_migration".

Change-Id: Iaa1e8b0d325ea690c6d6cb89e06006e7bbed9237

pytest.ini

@@ -4,6 +4,7 @@ render_collapsed = True
 markers =
   ovn_migration: test cases for testing OVN migration
   minimal: most relevant and lightweight test cases
+  skip_during_ovn_migration: test cases which shouldn't be run in the OVS to OVN migration jobs
 
 
 # rp_uuid = 887ab577-b89e-4b12-9d8f-03f7a0a5b14a

tobiko/tests/scenario/neutron/test_security_groups.py

@@ -18,6 +18,7 @@ import json
 import typing
 
 from oslo_log import log
+import pytest
 import testtools
 
 import tobiko
@@ -285,6 +286,7 @@ class CirrosServerWithStatelessSecurityGroupFixture(
         return [self.security_groups_stack.security_group_id]
 
 
+@pytest.mark.skip_during_ovn_migration
 @neutron.skip_if_missing_networking_extensions('stateful-security-group')
 class StatelessSecurityGroupInstanceTest(BaseSecurityGroupTest):
 

tox.ini

@@ -219,8 +219,8 @@ envdir = {[integration]envdir}
 passenv = {[integration]passenv}
 setenv =
     {[testenv:scenario]setenv}
-    RUN_TESTS_EXTRA_ARGS = -m ovn_migration {env:OS_TEST_PATH}
-
+    OS_TEST_PATH = {toxinidir}/tobiko/tests/scenario
+    RUN_TESTS_EXTRA_ARGS = -m "not skip_during_ovn_migration" {env:OS_TEST_PATH}
 
 [testenv:nova]