Fixed utils import in tests

tests/test_apt_proxy.py

tests/test_backup.py

tests/test_email.py

tests/test_fail2ban.py

tests/test_mediaworker.py

tests/test_monitoring.py

tests/test_nginx_status.py

tests/test_nginx_vhosts.py

tests/test_ntp.py

tests/test_ssl.py

tests/test_wowza.py