Fix airspace and remaining port problems from refactor

src/primaite/simulator/system/services/ftp/ftp_service.py

@@ -5,7 +5,6 @@ from typing import Dict, Optional
 
 from primaite.simulator.file_system.file_system import File
 from primaite.simulator.network.protocols.ftp import FTPCommand, FTPPacket, FTPStatusCode
-from primaite.simulator.network.transmission.transport_layer import Port
 from primaite.simulator.system.services.service import Service
 
 

src/primaite/simulator/system/services/service.py

@@ -52,7 +52,7 @@ class Service(IOSoftware):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
 
-    def __init_subclass__(cls, identifier: str = 'default', **kwargs: Any) -> None:
+    def __init_subclass__(cls, identifier: str = "default", **kwargs: Any) -> None:
         """
         Register a hostnode type.
 
@@ -60,7 +60,7 @@ class Service(IOSoftware):
         :type identifier: str
         :raises ValueError: When attempting to register an hostnode with a name that is already allocated.
         """
-        if identifier == 'default':
+        if identifier == "default":
             return
         # Enforce lowercase registry entries because it makes comparisons everywhere else much easier.
         identifier = identifier.lower()