[CI] Temporarily disable IPv6 scenario tests

We're experiencing failures to SSH into test
VMs over IPv6 IP addresses from private tenant
networks in the LVM driver job when testing
main branch code. It's possible this is a regression
in nova, neutron, neutron dynamic routing or bgp. We'll
drop this test exclusion when the bug has been
identified and fixed.

Change-Id: Ib39cb2bda862758f575262647e068dd9deaf1459
Partial-Bug: #1940324
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>

zuul.d/manila-tempest-jobs.yaml

@@ -58,7 +58,9 @@
     timeout: 10800
     irrelevant-files: *irrelevant-files
     required-projects: *manila-tempest-required-projects
-    vars: *manila-tempest-base-vars
+    vars:
+      <<: *manila-tempest-base-vars
+      tempest_exclude_regex: "(^manila_tempest_tests.tests.scenario.*IPv6.*)"
 
 - job:
     name: manila-tempest-plugin-standalone-base

zuul.d/manila-tempest-stable-jobs.yaml

@@ -5,15 +5,21 @@
     parent: manila-tempest-plugin-lvm
     override-checkout: stable/wallaby
     nodeset: openstack-single-node-focal
+    vars:
+        tempest_exclude_regex: ''
 
 - job:
     name: manila-tempest-plugin-lvm-victoria
     parent: manila-tempest-plugin-lvm
     override-checkout: stable/victoria
     nodeset: openstack-single-node-focal
+    vars:
+        tempest_exclude_regex: ''
 
 - job:
     name: manila-tempest-plugin-lvm-ussuri
     parent: manila-tempest-plugin-lvm
     override-checkout: stable/ussuri
     nodeset: openstack-single-node-bionic
+    vars:
+        tempest_exclude_regex: ''