Make ovn-octavia-provider-v2-dsvm-scenario voting

We still have scenario tests failing and it needs further work
in Octavia tempest plugin [1] and Core-OVN [2].
However, scenario tests are not the only ones that we expect to pass, so
for now ignore those test cases:

octavia_tempest_plugin.tests.scenario.v2.test_traffic_ops.TrafficOperationsScenarioTest.test_basic_traffic
octavia_tempest_plugin.tests.scenario.v2.test_traffic_ops.TrafficOperationsScenarioTest.test_basic_udp_traffic

and set this job to voting.

[1] https://review.opendev.org/#/c/714004/
[2] https://bugs.launchpad.net/neutron/+bug/1871239

Change-Id: I388438133e9028e7805aba017334d94a11aeda5f
(cherry picked from commit 5cebb58c1d)

zuul.d/base.yaml

@@ -128,5 +128,8 @@
     parent: ovn-octavia-provider-dsvm-base
     vars:
       tempest_test_regex: ^octavia_tempest_plugin.tests.scenario.v2
+      tempest_black_regex: "\
+        (^octavia_tempest_plugin.tests.scenario.v2.test_traffic_ops.TrafficOperationsScenarioTest.test_basic_traffic)|\
+        (^octavia_tempest_plugin.tests.scenario.v2.test_traffic_ops.TrafficOperationsScenarioTest.test_basic_udp_traffic)"
       tempest_concurrency: 2
       tox_envlist: all

zuul.d/project.yaml

@@ -11,9 +11,9 @@
             required-projects:
               - openstack/neutron
         - ovn-octavia-provider-functional
-        - ovn-octavia-provider-v2-dsvm-scenario:
-            voting: false
+        - ovn-octavia-provider-v2-dsvm-scenario
     gate:
       fail-fast: true
       jobs:
         - ovn-octavia-provider-functional
+        - ovn-octavia-provider-v2-dsvm-scenario