*(dnsforward): added QLogFile struct

This struct is supposed to use an easier algorithm for scanning query
log files. The end goal is allow us scanning multiple query log files.

querylog/querylog_file.go

@@ -18,6 +18,8 @@ import (
 )
 
 const enableGzip = false
+
+// TODO: Check this when we append a new line -- we don't want to have a line longer than this
 const maxEntrySize = 1000
 
 // flushLogBuffer flushes the current buffer to file and resets the current buffer