Update opendkim configuration to be more verbose

roles/common/templates/opendkim/opendkim.conf.j2

@@ -294,7 +294,7 @@ KeyTable      file:/etc/opendkim/KeyTable
 ##  in the amount of log data generated for each message, so it should be
 ##  limited to debugging use and not enabled for general operation.
 
-# LogWhy        no
+LogWhy        yes
 
 ##  MacroList macro[=value][,...]
 ##