fix(revpiconfig): Ensure systemd reloads after unit changes

Added systemd reload calls after unit enable/disable to reflect changes.
Adjusted DBus method calls to capture and utilize change outputs
effectively. This improves reliability in applying unit modifications.

src/revpi_middleware/dbus_middleware1/system_config/revpi_config.py

@@ -665,13 +665,29 @@ def simple_systemd(action: ConfigActions, unit: str):
     systemd_manager = systemd["org.freedesktop.systemd1.Manager"]
 
     if action is ConfigActions.ENABLE:
-        systemd_manager.UnmaskUnitFiles([unit], False)
-        systemd_manager.EnableUnitFiles([unit], False, False)
+        # Dbus call: UnmaskUnitFiles(in as files, in b runtime, out a(sss) changes
+        lst_change_unmask = systemd_manager.UnmaskUnitFiles([unit], False)
+
+        # Dbus call: EnableUnitFiles(in as files, in b runtime, in b force,
+        #                            out b carries_install_info, out a(sss) changes
+        lst_change_enable = systemd_manager.EnableUnitFiles([unit], False, False)
+        if lst_change_unmask or lst_change_enable:
+            # Reload systemd after modified unit property
+            systemd_manager.Reload()
+
+        # Dbus call: StartUnit(in s name, in s mode, out o job
         systemd_manager.StartUnit(unit, "replace")
 
     elif action is ConfigActions.DISABLE:
+
+        # Dbus call: StopUnit(in s name,in s mode, out o job
         systemd_manager.StopUnit(unit, "replace")
-        systemd_manager.DisableUnitFiles([unit], False)
+
+        # Dbus call: DisableUnitFiles (in as files, in b runtime, out a(sss) changes)
+        change = systemd_manager.DisableUnitFiles([unit], False)
+        if change:
+            # Reload systemd after modified unit property
+            systemd_manager.Reload()
 
     elif action is ConfigActions.STATUS:
         try:
@@ -696,6 +712,8 @@ def simple_systemd(action: ConfigActions, unit: str):
     else:
         raise ValueError(f"action {action} not supported")
 
+    return None
+
 
 if __name__ == "__main__":
     rc = RevPiConfig()