PermissionError with system-wide spoon install

[wvengen]

On a Linux system, when you install spoon, it raises a PermissionError on the logfile on loading.

1. pip3 install spoonproxy
2. any code loading e.g. the Manager will raise an error
   example: python3 -m spoon_server.main.manager

The following error is raised:

Traceback (most recent call last):
  File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.7/dist-packages/spoon_server/main/manager.py", line 5, in <module>
    from spoon_server.proxy.fetcher import Fetcher
  File "/usr/local/lib/python3.7/dist-packages/spoon_server/proxy/fetcher.py", line 2, in <module>
    from spoon_server.proxy.ip3366_provider import IP3366Provider
  File "/usr/local/lib/python3.7/dist-packages/spoon_server/proxy/ip3366_provider.py", line 2, in <module>
    from spoon_server.util.html_parser import get_html_tree
  File "/usr/local/lib/python3.7/dist-packages/spoon_server/util/html_parser.py", line 6, in <module>
    from spoon_server.util.logger import log
  File "/usr/local/lib/python3.7/dist-packages/spoon_server/util/logger.py", line 10, in <module>
    log_file_handler = TimedRotatingFileHandler(filename=os.path.join(log_path, "spoon.log"), when="D", interval=1)
  File "/usr/lib/python3.7/logging/handlers.py", line 199, in __init__
    BaseRotatingHandler.__init__(self, filename, 'a', encoding, delay)
  File "/usr/lib/python3.7/logging/handlers.py", line 54, in __init__
    logging.FileHandler.__init__(self, filename, mode, encoding, delay)
  File "/usr/lib/python3.7/logging/__init__.py", line 1092, in __init__
    StreamHandler.__init__(self, self._open())
  File "/usr/lib/python3.7/logging/__init__.py", line 1121, in _open
    return open(self.baseFilename, self.mode, encoding=self.encoding)
PermissionError: [Errno 13] Permission denied: '/usr/local/lib/python3.7/dist-packages/spoon_server/spoon.log'

This looks like a debugging left-over. I'd suggest to specify no default logging output, but leave that to the user of this package.