remove support of other CRI runtimes than Docker in the efk stack

roles/kubernetes-apps/efk/fluentd/templates/fluentd-config.yml.j2

@@ -334,17 +334,17 @@ data:
       tag docker
     </source>
 
-    <source>
+    # <source>
-      @id journald-container-runtime
+    #   @id journald-container-runtime
-      @type systemd
+    #   @type systemd
-      filters [{ "_SYSTEMD_UNIT": "{{ container_runtime }}.service" }]
+    #   filters [{ "_SYSTEMD_UNIT": "{% raw %}{{ container_runtime }} {% endraw %}.service" }]
-      <storage>
+    #   <storage>
-        @type local
+    #     @type local
-        persistent true
+    #     persistent true
-      </storage>
+    #   </storage>
-      read_from_head true
+    #   read_from_head true
-      tag container-runtime
+    #   tag container-runtime
-    </source>
+    # </source>
 
     <source>
       @id journald-kubelet