Refactor imports in firewall.py and scan.py to use ip_utils; remove utils module

firewall.py

@@ -13,7 +13,7 @@ import paramiko
 from datetime import datetime
 import shlex
 from typing import Iterable
-from utils import is_whitelisted, parse_ip, split_versions
+from ip_utils import is_whitelisted
 
 DATA_DIR = os.path.join(os.path.dirname(__file__), "data", "mikrotik")
 REPORT_DIR = os.path.join(os.path.dirname(__file__), "reports")