docsbuilding: rename the cronjob cron instead of build.

This will allow to delete the yml file when running the
playbook with the delete tag

Signed-off-by: Clement Verna <cverna@tutanota.com>

playbooks/openshift-apps/docsbuilding.yml

@@ -47,5 +47,5 @@
   - role: openshift/object-delete
     app: docsbuilding
     objecttype: cronjob
-    objectname: build
+    objectname: cron
     tags: [ never, delete ]

roles/openshift-apps/docsbuilding/templates/cron.yml

@@ -1,7 +1,7 @@
 apiVersion: batch/v1beta1
 kind: CronJob
 metadata:
-  name: build
+  name: cron
 spec:
   concurrencyPolicy: Forbid
   schedule: "0 * * * *"