feat(revpiconfig): Make unit config changes asynchronous

Refactored unit enable/disable actions to run in separate threads,
ensuring non-blocking operations. This enhances performance and avoids
potential delays during systemd operations.

src/revpi_middleware/dbus_middleware1/system_config/revpi_config.py

@@ -10,6 +10,7 @@ from glob import glob
 from logging import getLogger
 from os import X_OK, access
 from os.path import exists, join
+from threading import Thread
 from typing import List, Optional
 
 from pydbus import SystemBus
@@ -665,6 +666,9 @@ def simple_systemd(action: ConfigActions, unit: str):
     systemd_manager = systemd["org.freedesktop.systemd1.Manager"]
 
     if action is ConfigActions.ENABLE:
+
+        def thread_unit_config():
+            """Change configuration asynchronously."""
             # Dbus call: UnmaskUnitFiles(in as files, in b runtime, out a(sss) changes
             lst_change_unmask = systemd_manager.UnmaskUnitFiles([unit], False)
 
@@ -675,20 +679,27 @@ def simple_systemd(action: ConfigActions, unit: str):
                 # Reload systemd after modified unit property
                 systemd_manager.Reload()
 
+        Thread(target=thread_unit_config, daemon=True).start()
+
         # 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
+        def thread_unit_config():
-        systemd_manager.StopUnit(unit, "replace")
+            """Change configuration asynchronously."""
-
             # 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()
 
+        Thread(target=thread_unit_config, daemon=True).start()
+
+        # Dbus call: StopUnit(in s name,in s mode, out o job
+        systemd_manager.StopUnit(unit, "replace")
+
+
     elif action is ConfigActions.STATUS:
         try:
             unit_path = systemd_manager.LoadUnit(unit)