Replay log files without start times

We were trying to solve the timestamp problem for them unsuccessfully.
Turns out our solver isn't a bit fan of solving for min_time...

These times make no sense to have in our interpolation table, so just
don't solve for them.

Change-Id: Iac1fdfb75b83bb6f2c6417caaa436d44e7836365
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/events/logging/logger_test.cc b/aos/events/logging/logger_test.cc
index 6d45413..55bf687 100644
--- a/aos/events/logging/logger_test.cc
+++ b/aos/events/logging/logger_test.cc
@@ -2739,8 +2739,21 @@
 
   EXPECT_TRUE(timestamp_file_count == 2u || timestamp_file_count == 4u);
 
-  // TODO(austin): Finish reading it.  We don't have a valid start time so
-  // log_reader gets rather grumpy.
+  // Confirm that we can actually sort the resulting log and read it.
+  {
+    LogReader reader(SortParts(filenames));
+
+    SimulatedEventLoopFactory log_reader_factory(reader.configuration());
+    log_reader_factory.set_send_delay(chrono::microseconds(0));
+
+    // This sends out the fetched messages and advances time to the start of
+    // the log file.
+    reader.Register(&log_reader_factory);
+
+    log_reader_factory.Run();
+
+    reader.Deregister();
+  }
 }
 
 // Tests that we properly handle one direction of message_bridge being