Remove reverse DNS lookup

It wasn't working for years because the functionality was removed from http.server.
Nobody complained.

config

@@ -45,9 +45,6 @@
 # Available ciphers. See python's ssl module for available ciphers
 #ciphers =
 
-# Reverse DNS to resolve client address in logs
-#dns_lookup = True
-
 
 [encoding]
 

radicale/config.py

@@ -135,11 +135,7 @@ DEFAULT_CONFIG_SCHEMA = OrderedDict([
         ("ciphers", {
             "value": "",
             "help": "available ciphers",
-            "type": str}),
-        ("dns_lookup", {
-            "value": "True",
-            "help": "use reverse DNS to resolve client address in logs",
-            "type": bool})])),
+            "type": str})])),
     ("encoding", OrderedDict([
         ("request", {
             "value": "utf-8",

radicale/server.py

@@ -281,11 +281,6 @@ def serve(configuration, shutdown_socket=None):
                 raise RuntimeError("Failed to read SSL %s %r: %s" %
                                    (name, filename, e)) from e
 
-    class RequestHandlerCopy(RequestHandler):
-        """Copy, avoids overriding the original class attributes."""
-    if not configuration.get("server", "dns_lookup"):
-        RequestHandlerCopy.address_string = lambda self: self.client_address[0]
-
     if systemd:
         listen_fds = systemd.daemon.listen_fds()
     else:
@@ -305,7 +300,7 @@ def serve(configuration, shutdown_socket=None):
     application = Application(configuration)
     for server_address in server_addresses:
         try:
-            server = ServerCopy(server_address, RequestHandlerCopy)
+            server = ServerCopy(server_address, RequestHandler)
             server.set_app(application)
         except OSError as e:
             raise RuntimeError(