Add victoria/wallaby stable branch jobs on master gate

We have stable/victoria and stable/wallaby released so we
should add their job on master gate to keep branchless
tempest plugins compatible to those branch.

This also removes the stable/stein job as that is in EM
state now.

Ref: Tempest plugins guide for stable branch testing:
- https://docs.openstack.org/tempest/latest/stable_branch_testing_policy.html

Change-Id: I2bd157aab1ec857fcb2acc0dcffc23b0cf1bab8f

.zuul.yaml

@@ -10,13 +10,24 @@
             voting: true
         - cloudkitty-tempest-full-v2-storage-elasticsearch:
             voting: true
+        - cloudkitty-tempest-full-v2-storage-influxdb-wallaby
+        - cloudkitty-tempest-full-v2-storage-influxdb-victoria
         - cloudkitty-tempest-full-v2-storage-influxdb-ussuri
         - cloudkitty-tempest-full-v2-storage-influxdb-train
-        - cloudkitty-tempest-full-v2-storage-influxdb-stein
     gate:
       queue: cloudkitty
       jobs: *cloudkitty_tempest_jobs
 
+- job:
+    name: cloudkitty-tempest-full-v2-storage-influxdb-wallaby
+    parent: cloudkitty-tempest-full-v2-storage-influxdb
+    override-checkout: stable/wallaby
+
+- job:
+    name: cloudkitty-tempest-full-v2-storage-influxdb-victoria
+    parent: cloudkitty-tempest-full-v2-storage-influxdb
+    override-checkout: stable/victoria
+
 - job:
     name: cloudkitty-tempest-full-v2-storage-influxdb-ussuri
     parent: cloudkitty-tempest-full-v2-storage-influxdb
@@ -29,11 +40,3 @@
     vars:
       devstack_localrc:
         USE_PYTHON3: True
-
-- job:
-    name: cloudkitty-tempest-full-v2-storage-influxdb-stein
-    parent: cloudkitty-tempest-full-v2-storage-influxdb
-    override-checkout: stable/stein
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: True