Fluentd: remove apache record_transformer filter

Record transformer is used to add a 'Severity' field in event.
This Field is unused and not generated for other programs, hence
It can be removed safely.

Change-Id: I62e461e5006516dcbd6c64e1770d6936f9a9d55c

ansible/roles/common/templates/conf/format/apache_access.conf.j2

@@ -8,11 +8,3 @@
   time_format %d/%b/%Y:%H:%M:%S %z
   keep_time_key true
 </filter>
-
-<filter apache_access>
-   @type record_transformer
-   <record>
-     log_level INFO
-     Severity 6
-   </record>
-</filter>