Switch default Ansible version to 5 in all tenants

In our earlier announcement we said we'd do this on June 30, which
was over a week ago. We should probably go ahead and get it done,
but maybe not over a weekend.

https://lists.opendev.org/pipermail/service-announce/2022-June/000041.html

Change-Id: Id654f7a08f1e0ca0b432684d881bed53e4bb03d1

zuul/main.yaml

@@ -17,6 +17,7 @@
       - local-admin
       - infra-root
       - tenant-group
+    default-ansible-version: '5'
     max-nodes-per-job: 10
     source:
       gerrit:
@@ -85,6 +86,7 @@
 - tenant:
     name: openstack
     admin-rules: *admin_rules
+    default-ansible-version: '5'
     max-nodes-per-job: 10
     source:
       gerrit:
@@ -1437,6 +1439,7 @@
 - tenant:
     name: vexxhost
     admin-rules: *admin_rules
+    default-ansible-version: '5'
     max-nodes-per-job: 10
     source:
       gerrit:
@@ -1614,6 +1617,7 @@
 - tenant:
     name: pyca
     admin-rules: *admin_rules
+    default-ansible-version: '5'
     max-nodes-per-job: 1
     source:
       gerrit:
@@ -1640,6 +1644,7 @@
 - tenant:
     name: pypa
     admin-rules: *admin_rules
+    default-ansible-version: '5'
     max-nodes-per-job: 1
     source:
       gerrit: