fixing some flake8 errors

fixing some pep8 errors:
```bash
[WARN]  flake8: src/main/python/yadtminion/configuration.py:2:1: F401 'Status' imported but unused
[WARN]  flake8: src/main/python/yadtminion/configuration.py:8:9: F821 undefined name 'sys')
[WARN]  flake8: src/main/python/yadtminion/configuration.py:9:9: F821 undefined name 'sys'
```