SelfsignedKeyCertPair only works with German time format

Summary

When generating a SelfsignedKeyCertPair the country code is expected as two letters, e.g. "DE" for Germany. But not every country uses only two letters for its language, e.g. USA has "English" which is more than two letters. The x509 certificate expects only two letters

Solutions

Set the default value for the country code to "DE" or to empty string "". Fetching the country code based on the python locale module is not reliable, as it just checks the user setting on region. The real location is not trivial to get, so it's best to make the country code an explicit parameter that needs to be set.

Was there an error message?

Process Process-1:
Traceback (most recent call last):
  File "multiprocessing\process.py", line 314, in _bootstrap
  File "multiprocessing\process.py", line 108, in run
  File "eta_datarecorder\data_recorder.py", line 147, in main
  File "eta_datarecorder\data_recorder.py", line 99, in run_datarecorder
  File "eta_datarecorder\data_recorder.py", line 91, in _intialize_key_cert
  File "eta_utility\util.py", line 477, in __init__
  File "eta_utility\util.py", line 525, in generate_cert
  File "cryptography\x509\name.py", line 142, in __init__
ValueError: Country name must be a 2 character country code

Steps to reproduce

Change date format to US or UK