Description of problem:
When the `total_limit_size` for fluentd is configured according to the documentation. The wrong total_limit_size is shown in the logs

Version-Release number of selected component (if applicable):
5.0

How reproducible:
Steps to Reproduce:
1. Deploy cluster-logging
2. Set total_limit_size for fluentd
~~~~

1. oc edit ClusterLogging instance
   spec:
   forwarder:
   fluentd:
   buffer:
   totalLimitSize: 8G
   ~~~~

3. Verify that it is applied
~~~~

1. oc extract configmap/fluentd --confirm
2. grep total_limit_size fluent.conf
   ~~~~

4. View logs
~~~~

Actual results:
$ oc logs fluentd-6d5bz

Setting each total_size_limit for 2 buffers to 9622544486 bytes

Setting queued_chunks_limit_size for each buffer to 1147

Setting chunk_limit_size for each buffer to 8388608

Expected Results:

$oc logs fluentd-b49m6

Setting each total_size_limit for 2 buffers to 8589934592 bytes

Setting queued_chunks_limit_size for each buffer to 1024

Setting chunk_limit_size for each buffer to 8388608

Additional info: