Implement option to configure the hmac time difference tolerance

[nicksinger]

Let me know if I should split out https://github.com/os-autoinst/openQA/commit/46a4bec8bc8c65a6972ef171fff5b88fcafc2b9a into a different PR

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.47%. Comparing base (468dc67) to head (3883e61).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5787 +/- ## ======================================= Coverage 98.47% 98.47% ======================================= Files 394 394 Lines 38676 38677 +1 ======================================= + Hits 38088 38089 +1 Misses 588 588 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.