Add stable/xena job and drop stable/ussuri job

stable/ussuri has now been transitioned to EM (Extended Maintenance) [1].
So we can stop testing manila-tempest-plugin changes against that branch,
and introduce a stable/xena job.

Dropping the stable/ussuri job does not mean that manila-tempest-plugin
does not support running against that branch. Extended maintenance
branches (stable/ussuri, train and stein at the moment) still get
per-commit testing when changes are posted to the manila repo against
those branches.

Change-Id: I1e019ec913f8933d50afae6739352686725f4780
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
diff --git a/zuul.d/manila-tempest-stable-jobs.yaml b/zuul.d/manila-tempest-stable-jobs.yaml
index ff74f5d..3d2447e 100644
--- a/zuul.d/manila-tempest-stable-jobs.yaml
+++ b/zuul.d/manila-tempest-stable-jobs.yaml
@@ -1,6 +1,16 @@
 # Stable branch jobs to test the trunk version of manila-tempest-plugin against
 # released stable branches of manila
 - job:
+    name: manila-tempest-plugin-lvm-xena
+    parent: manila-tempest-plugin-lvm
+    override-checkout: stable/xena
+    nodeset: openstack-single-node-focal
+    vars:
+        # NOTE(gouthamr): Disabled until https://launchpad.net/bugs/1940324 is
+        # fixed.
+        tempest_exclude_regex: "(^manila_tempest_tests.tests.scenario.*IPv6.*)"
+
+- job:
     name: manila-tempest-plugin-lvm-wallaby
     parent: manila-tempest-plugin-lvm
     override-checkout: stable/wallaby
@@ -15,11 +25,3 @@
     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: ''