Temporarily disable most of the jobs

refstack jobs are broken and require a fix (see follow up patches)
on refstack-client side which can't be merged without a fix
on ansible-role-refstack-client.

python jobs are broken too and require a fix in refstack-client
(already proposed) which can't be merged without other mentioned
fixes.

This will be reverted as soon as the issue is resolved.

Change-Id: Ic00064ed0769aaad3730f1db6889ca180860370b

.zuul.yaml

@@ -1,23 +1,9 @@
 - project:
-    templates:
-      - openstack-cover-jobs
-      - openstack-python37-jobs
-      - openstack-python3-yoga-jobs
     check:
       jobs:
-        - refstack-client-devstack-master
-        - refstack-client-devstack-wallaby
-        - refstack-client-devstack-victoria
-        - refstack-client-devstack-ussuri
-        - refstack-client-devstack-train
         - opendev-tox-docs
     gate:
       jobs:
-        - refstack-client-devstack-master
-        - refstack-client-devstack-wallaby
-        - refstack-client-devstack-victoria
-        - refstack-client-devstack-ussuri
-        - refstack-client-devstack-train
         - opendev-tox-docs
     promote:
       jobs: