Fluent-logging: Update default fluentbit configuration

As of 0.12.14, fluentbit exposes a flag for setting the db_sync
behavior for writing the location of the tail input to its sqlite
database. The default setting is Full, which introduces additional
synchronizations before and after a transaction. This has the
potential to negatively affect disk performance with the extra
synchronizations. This moves the setting in the chart to Normal,
which performs fewer synchronizations and still maintains a high
level of safety with status writes

Change-Id: I3b437edd6bd7501ef37ce06f0a561bd1747eb290

fluent-logging/values.yaml

@@ -103,7 +103,7 @@ conf:
   fluentbit:
     - service:
         header: service
-        Flush: 5
+        Flush: 30
         Daemon: Off
         Log_Level: info
         Parsers_File: parsers.conf
@@ -115,6 +115,9 @@ conf:
         Parser: docker
         DB: /var/log/flb_kube.db
         Mem_Buf_Limit: 5MB
+        DB.Sync: Normal
+        Buffer_Chunk_Size: 1M
+        Buffer_Max_Size: 1M
     - kube_filter:
         header: filter
         Name: kubernetes