[stable-only] Specify openstacksdk stable branch

Taking the advice given here:
http://lists.openstack.org/pipermail/openstack-discuss/2022-January/026905.html
to fix the openstacksdk-functional-devstack job.

This job is not specified in glance's .zuul.yaml, but is brought in
by the integrated-gate-storage template:
https://opendev.org/openstack/tempest/src/commit/86db21ea6afb6c26a21fc143a7d061e947c31a93/zuul.d/integrated-gate.yaml#L382-L398

So we add the job here so that we can override its definition.

Change-Id: I8f1f38df4746cced085fb1cb4e96540763cdda13
(cherry picked from commit b76dd78)

Author: ostackbrian

.zuul.yaml

@@ -329,6 +329,11 @@
         - nova-ceph-multistore:
             irrelevant-files: *tempest-irrelevant-files
         - glance-secure-rbac-protection-functional
+        - openstacksdk-functional-devstack:
+            required-projects:
+            - name: opendev.org/openstack/openstacksdk
+              override-branch: stable/wallaby
+            irrelevant-files: *tempest-irrelevant-files
 
     gate:
       jobs:
@@ -347,6 +352,11 @@
         - nova-ceph-multistore:
             irrelevant-files: *tempest-irrelevant-files
         - glance-secure-rbac-protection-functional
+        - openstacksdk-functional-devstack:
+            required-projects:
+            - name: opendev.org/openstack/openstacksdk
+              override-branch: stable/wallaby
+            irrelevant-files: *tempest-irrelevant-files
     experimental:
       jobs:
         - glance-tox-py38-glance_store-tips