Use wallaby jobs

Also re-oreder jobs and add common openstack jobs for cover and
lower-constraints.
And disable dstat to prevent failures due to dstat bug in focal.

Change-Id: Ia219fdaac13c21d9fce08e69b45945d4b5e37a89

zuul.d/project.yaml

@@ -1,9 +1,11 @@
 - project:
     templates:
-      - release-notes-jobs-python3
-      - publish-openstack-docs-pti
-      - openstack-python3-ussuri-jobs
       - check-requirements
+      - openstack-cover-jobs
+      - openstack-lower-constraints-jobs
+      - openstack-python3-wallaby-jobs
+      - publish-openstack-docs-pti
+      - release-notes-jobs-python3
     check:
       jobs:
         - virtualbmc-tempest-ironic-ipmi-iscsi

zuul.d/virtualbmc-jobs.yaml

@@ -17,3 +17,5 @@
         EBTABLES_RACE_FIX: True
         IRONIC_DEFAULT_BOOT_OPTION: netboot
         IRONIC_DEFAULT_RESCUE_INTERFACE: ""
+      devstack_services:
+        dstat: false