L2SS-340: Let UDPReceiver baseclass handle __del__

devices/clients/udp_receiver.py

@@ -27,12 +27,12 @@ class UDPReceiver(Thread, StatisticsClientThread):
 
         try:
             self.host = self.options['udp_host']
-        except Exception:
+        except KeyError:
             raise
 
         try:
             self.port = self.options['udp_port']
-        except Exception:
+        except KeyError:
             raise
 
         self.poll_timeout = self.options['poll_timeout']
@@ -123,6 +123,3 @@ class UDPReceiver(Thread, StatisticsClientThread):
         if self.is_alive():
             # there is nothing we can do except wait (stall) longer, which could be indefinitely.
             logger.error(f"UDP thread for {self.host}:{self.port} did not shut down after {self.DISCONNECT_TIMEOUT} seconds, just leaving it dangling. Please attach a debugger to thread ID {self.ident}.")
-
-    def __del__(self):
-        self.disconnect()