Add yoga stable branch jobs on master gate

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

This also removes the stable/ussuri job as it 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: I1297877db64364436d5160720bf33962024964e4

.zuul.yaml

@@ -1,9 +1,3 @@
-- job:
-    name: zun-tempest-py3-docker-sql-ussuri
-    parent: zun-tempest-py3-docker-sql
-    nodeset: openstack-single-node-bionic
-    override-checkout: stable/ussuri
-
 - job:
     name: zun-tempest-py3-docker-sql-victoria
     parent: zun-tempest-py3-docker-sql
@@ -22,6 +16,12 @@
     nodeset: openstack-single-node-focal
     override-checkout: stable/xena
 
+- job:
+    name: zun-tempest-py3-docker-sql-yoga
+    parent: zun-tempest-py3-docker-sql
+    nodeset: openstack-single-node-focal
+    override-checkout: stable/yoga
+
 - project:
     templates:
       - check-requirements
@@ -30,16 +30,16 @@
     check:
       jobs:
         - zun-tempest-py3-docker-sql
-        - zun-tempest-py3-docker-sql-ussuri
         - zun-tempest-py3-docker-sql-victoria
         - zun-tempest-py3-docker-sql-wallaby
         - zun-tempest-py3-docker-sql-xena
+        - zun-tempest-py3-docker-sql-yoga
         - zun-tempest-multinode-docker-sql
     gate:
       queue: zun
       jobs:
         - zun-tempest-py3-docker-sql
-        - zun-tempest-py3-docker-sql-ussuri
         - zun-tempest-py3-docker-sql-victoria
         - zun-tempest-py3-docker-sql-wallaby
         - zun-tempest-py3-docker-sql-xena
+        - zun-tempest-py3-docker-sql-yoga