test: fix the Vuln Detector framework import in integration tests

...n/test_vulnerability_detector/test_cpe_helper/__init__.py

...tector/test_cpe_helper/test_cpe_indexing_missing_field.py

..._detector/test_cpe_helper/test_cpe_indexing_wrong_tags.py

...etector/test_cpe_helper/test_cpe_indexing_wrong_values.py

...vulnerability_detector/test_feeds/test_duplicate_feeds.py

..._vulnerability_detector/test_general_settings/__init__.py

...on/test_vulnerability_detector/test_providers/__init__.py

...test_vulnerability_detector/test_scan_results/__init__.py

...n/test_vulnerability_detector/test_scan_types/__init__.py

...ability_detector/test_vulnerability_inventory/__init__.py