Disable trunk subports connectivity test on Rocky iptables_hybrid job

Recent Rocky backports fail
neutron-tempest-plugin-scenario-openvswitch-iptables_hybrid-rocky job
and as mentioned in linked bug, this is expected as using trunks with
iptables-hybrid driver is not supported.

Add the test to the job blacklist

Change-Id: Iba083f66a4df8ecce23be07ec017d7dfc78406db
Related-Bug: #1838760
diff --git a/.zuul.yaml b/.zuul.yaml
index 98a3c3a..e283b35 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -680,8 +680,11 @@
         USE_PYTHON3: false
         NETWORK_API_EXTENSIONS: "{{ network_api_extensions | join(',') }}"
         TEMPEST_PLUGINS: /opt/stack/neutron-tempest-plugin
-      # NOTE(bcafarel): newer tests, unstable on rocky branch
+      # TODO(bcafarel): remove trunks subport_connectivity test from blacklist
+      # when bug https://bugs.launchpad.net/neutron/+bug/1838760 will be fixed
+      # NOTE(bcafarel): other are newer tests, unstable on rocky branch
       tempest_black_regex: "\
+          (^neutron_tempest_plugin.scenario.test_trunk.TrunkTest.test_subport_connectivity)|\
           (^neutron_tempest_plugin.scenario.test_port_forwardings.PortForwardingTestJSON.test_port_forwarding_to_2_servers)|\
           (^neutron_tempest_plugin.scenario.test_security_groups.NetworkSecGroupTest.test_multiple_ports_portrange_remote)"
     branches: