message: access_log_formatter: timezone fix
diff: @@ -362,7 +362,12 @@ TEST(AccessLogFormatterTest, CompositeFormatterSuccess) {
  EXPECT_CALL(request_info, startTime()).WillRepeatedly(Return(time));
  FormatterImpl formatter(format);
  - EXPECT_EQ("2018/03/28|1522280158|bad_format|2018-03-28T23:35:58.000Z",
  + // Needed to take into account the behavior in non-GMT timezones.
  + struct tm time_val;
  + gmtime_r(&test_epoch, &time_val);
  + time_t expected_time_t = mktime(&time_val);
  +
  + EXPECT_EQ(fmt::format("2018/03/28|{}|bad_format|2018-03-28T23:35:58.000Z", expected_time_t),
  formatter.format(request_header, response_header, request_info));
  }
  }
  