Bug 1420234 - illegal_argument_exception in Kibana UI.

https://bugzilla.redhat.com/show_bug.cgi?id=1420234
The problem is that the fluent.conf is missing the common data model
filter which renames the "time" field to the "@timestamp" field.

roles/openshift_logging/files/fluent.conf

@@ -22,6 +22,7 @@
   @include configs.d/openshift/filter-k8s-flatten-hash.conf
   @include configs.d/openshift/filter-k8s-record-transform.conf
   @include configs.d/openshift/filter-syslog-record-transform.conf
+  @include configs.d/openshift/filter-common-data-model.conf
   @include configs.d/openshift/filter-post-*.conf
 ##