Restore bionic/ceph voting jobs

In https://review.openstack.org/609329 we had to disable
boting for the bionic/ceph jobs due to RGW segfaulting
when running tempest tests. This patch restores the jobs
to voting again.

Change-Id: I81df511d61206ebe206259b87abfd1f49625ad2f

zuul.d/project-templates.yaml

@@ -94,10 +94,14 @@
     name: openstack-ansible-deploy-ceph-jobs
     check:
       jobs:
-        - openstack-ansible-deploy-ceph-ubuntu-bionic:
-            voting: false
+        - openstack-ansible-deploy-ceph-ubuntu-bionic
     gate:
-      jobs: []
+      jobs:
+        - openstack-ansible-deploy-ceph-ubuntu-bionic
+    periodic:
+      jobs:
+        - openstack-ansible-deploy-ceph-ubuntu-bionic
+        - openstack-ansible-upgrade-ceph-ubuntu-bionic
 
 - project-template:
     name: openstack-ansible-deploy-distro_ceph-jobs