Fix the wrong output from suspend cycles (Bugfix)

[seankingyang]

Description

The bug numbers of sleep_test_log_check.py summary are wrong.
For the following case, it only run 30 suspend with 3 reboot, and it total suspend number is 90.
But the failures number is much larger than 90.

Critical failures:
  s3: 30 failures
========================================
    Expected /sys/power/suspend_stats/total_hw_sleep to increase from 4234715566, got 4234715566. (x 15)
    CRITICAL Kernel message: [ 1969.104760] PM: Some devices failed to suspend, or early wake event detected (x 15)
High failures:
  s3: 1129 failures
========================================
    Expected /sys/power/suspend_stats/last_hw_sleep to be at least 70% of the last sleep cycle, got 0.14%. (x 29)
  <..skip..>
    Expected /sys/power/suspend_stats/last_hw_sleep to be at least 70% of the last sleep cycle, got 68.83%. (x 10)

## Test the 30 suspend with 3 reboot, so the total suspend number should 90.
./submission_202312-33226_365937 $ grep "Iteration" attachment_files/com.canonical.certification__stress-tests_suspend-30-cycles-with-reboot-3-log-attach| nl 
     1  ================================= Iteration 1 ==================================
     2  ================================= Iteration 1 ==================================
     3  ================================= Iteration 1 ==================================
<...skip...>
  1393  ================================= Iteration 1 ==================================
  1394  ================================= Iteration 1 ==================================
  1395  ================================= Iteration 1 ==================================

## How does the 1395 come?
Coz the log will be append in next time, and this log will only destory when reboot/poweroff.
Each reboot will have the (1+30)*30/2 times of fwts log.
Total:
(1+30)*30/2 * 3 (with 3 reboot)= 1395

The RC of this issue is:
checkbox-support-fwts_test script will default restore the log (/tmp/fwts_results.log), and this log will be append in next time.
Only need to remove the /tmp/fwts_results.log, and this issue will not hanppen.

Resolved issues

Wrong number of fwts bug summary.

Documentation

Tests

https://certification.canonical.com/hardware/202312-33226/submission/366229/

## Test the 10 suspend with 3 reboot, so the total suspend number will be 30.

./submission_202312-33226_366229 $ grep "Iteration" attachment_files/com.canonical.certification__stress-tests_suspend-10-cycles-with-reboot-3-log-attach|nl                                                      
     1  ================================= Iteration 1 ==================================
     2  ================================= Iteration 1 ==================================
     3  ================================= Iteration 1 ==================================
     4  ================================= Iteration 1 ==================================
     5  ================================= Iteration 1 ==================================
     6  ================================= Iteration 1 ==================================
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.32%. Comparing base (9318a5c) to head (48aa5a4).

Additional details and impacted files

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  Coverage   43.32%   43.32%           
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  Files         356      356           
  Lines       38658    38658           
  Branches     6559     6559           
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  Hits        16750    16750           
  Misses      21245    21245           
  Partials      663      663           

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[Hook25]

Another possible solution was to pass to the fwts_test.py script the log file name via -l so that we don't loose the log in case we want to read it but all the infos are in the checkbox submission, so nothing of value should be lost by doing this

+1