[FT] Isolate randomly failing address scope tests

These tests randomly failing for different reasons
as described in the bug, moving these to run with
concurrency 1 will help.

Partial-Bug: #2115026
Change-Id: I21f0993356fe4d1ad518bd5b991541cc9c3fb425
(cherry picked from commit 5c6a100)
Signed-off-by: yatinkarel <[email protected]>

Author: karelyatin

tox.ini

@@ -85,7 +85,7 @@ description =
     Run functional gate tests that require sudo privileges.
 setenv = {[testenv:dsvm-functional]setenv}
 deps = {[testenv:dsvm-functional]deps}
-test_regex = .*MySQL\.|.*test_get_all_devices|.*TestMetadataAgent\.|.*BaseOVSTestCase\.|.*test_periodic_sync_routers_task|.*TestOvnNbSync.*|.*TestMaintenance|.*TestLogMaintenance|.*TestNBDbMonitor.*|.*test_ovn_client.*|.*test_initialize_network_segment_range_support_parallel_execution.*
+test_regex = .*MySQL\.|.*test_get_all_devices|.*TestMetadataAgent\.|.*BaseOVSTestCase\.|.*test_periodic_sync_routers_task|.*TestOvnNbSync.*|.*TestMaintenance|.*TestLogMaintenance|.*TestNBDbMonitor.*|.*test_ovn_client.*|.*test_initialize_network_segment_range_support_parallel_execution.*|.*test_direct_route_for_address_scope.*|.*test_fip_connection_for_address_scope.*
 commands =
   bash {toxinidir}/tools/deploy_rootwrap.sh {toxinidir} {envdir}/etc {envdir}/bin
   stestr run --slowest --exclude-regex ({[testenv:dsvm-functional-gate]test_regex}|neutron.tests.functional.agent.l3.*) {posargs}