Make the --output option work again

[sgiehl]

Description:

While writing some integration tests for Matomo and Log importer (see https://github.com/matomo-org/matomo/pull/17700) I realized that the --output option always results in a

Traceback (most recent call last):
  File "/srv/matomo/misc/log-analytics/import_logs.py", line 2667, in <module>
    config = Configuration()
  File "/srv/matomo/misc/log-analytics/import_logs.py", line 1029, in __init__
    self._parse_args(self._create_parser(), argv)
  File "/srv/matomo/misc/log-analytics/import_logs.py", line 939, in _parse_args
    sys.stdout = sys.stderr = open(self.options.output, 'a+', 0)
ValueError: can't have unbuffered text I/O

Guess that is a regression from python3 migration

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed