action_utils: Stop associated service when stopping a socket unit

Tests:

- Unit tests pass.

- Radicale and Bepasty functional tests pass with changes to migrate to new
systemd socket-activated units.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/action_utils.py

@@ -123,6 +123,14 @@ def service_disable(service_name: str, check: bool = False):
     except subprocess.CalledProcessError:
         pass
 
+    if service_name.endswith('.socket'):
+        # Instead, may need to query the unit for associated .service file.
+        base_name = service_name.rpartition('.')[0]
+        try:
+            service_stop(f'{base_name}.service', check=check)
+        except subprocess.CalledProcessError:
+            pass
+
 
 def service_mask(service_name: str, check: bool = False):
     """Mask a service"""