Mark functional L3ha tests as unstable

All functional tests which uses wait_until_ha_router_has_state() method
are now marked as unstable so in case of timeout while waiting for
router's state transition, job will not fail.

Related-Bug: #1956958
Change-Id: I0e5d08c1a9dc475c7b138c4934ef0331a4339a4c
(cherry picked from commit d13da77)

Author: slawqo

neutron/tests/functional/agent/l3/framework.py

@@ -40,6 +40,7 @@
 from neutron.conf.agent import common as agent_config
 from neutron.conf.agent.l3 import config as l3_config
 from neutron.conf import common as common_config
+from neutron.tests import base as test_base
 from neutron.tests.common import l3_test_common
 from neutron.tests.common import net_helpers
 from neutron.tests.functional import base
@@ -703,8 +704,8 @@ def fail_ha_router(self, router):
         ha_device = ip_lib.IPDevice(device_name, router.ha_namespace)
         ha_device.link.set_down()
 
-    @staticmethod
-    def wait_until_ha_router_has_state(router, expected_state):
+    @test_base.unstable_test("bug 1956958")
+    def wait_until_ha_router_has_state(self, router, expected_state):
 
         def router_has_expected_state():
             state = router.ha_state