Add a flag to quiet down log file sorting

When a bunch of part files get truncated, the resulting log file spam is
enough that the actual error gets dwarfed.  The value isn't there.  This
lets the user turn that off if they want.

Change-Id: I2a317dd1d74f8ef1ad55402d4cb732ee88c1b087
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/events/logging/logfile_utils.h b/aos/events/logging/logfile_utils.h
index 3a84726..f2bdc42 100644
--- a/aos/events/logging/logfile_utils.h
+++ b/aos/events/logging/logfile_utils.h
@@ -202,7 +202,7 @@
 // Class to read chunks out of a log file.
 class SpanReader {
  public:
-  SpanReader(std::string_view filename);
+  SpanReader(std::string_view filename, bool quiet = false);
 
   std::string_view filename() const { return filename_; }