feat: Add bus_filter to dbus_stop for selective stopping

Enhanced the `dbus_stop` method in `MiddlewareDaemon` to support an
optional `bus_filter` parameter, allowing selective stopping of bus
providers. Updated imports to include `List` from `typing`.

Signed-off-by: Sven Sager <s.sager@kunbus.com>

src/revpi_middleware/daemon.py

@@ -6,7 +6,7 @@
 from logging import getLogger
 from threading import Event
 from time import perf_counter
-from typing import Union
+from typing import Union, List
 
 from dbus import SystemBus, SessionBus
 
@@ -65,17 +65,23 @@ class MiddlewareDaemon:
 
         log.debug("leave MiddlewareDaemon.dbus_start")
 
-    def dbus_stop(self):
+    def dbus_stop(self, bus_filter: List[object] = None):
         log.debug("enter MiddlewareDaemon.dbus_stop")
 
-        if self.bp_middleware1:
+        if bus_filter is None:
+            bus_filter = [
+                self.bp_middleware1,
+                self.bp_ios1,
+            ]
+
+        if self.bp_middleware1 and self.bp_middleware1 in bus_filter:
             self.bp_middleware1.stop()
             self.bp_middleware1.join(timeout=10.0)
             if self.bp_middleware1.is_alive():
                 log.warning("dbus middleware1 provider thread is still alive")
             self.bp_middleware1.bus.con.close()
 
-        if self.bp_ios1:
+        if self.bp_ios1 and self.bp_ios1 in bus_filter:
             self.bp_ios1.stop()
             self.bp_ios1.join(timeout=10.0)
             if self.bp_ios1.is_alive():