tornado: Drop unused command-line flags.

These flags were put in place in the first commit that introduced
Tornado (9afd63692f) with unclear
utility.

Remove them, since they have never been documented, and do not have a
clear need.

zerver/management/commands/runtornado.py

@@ -49,20 +49,6 @@ class Command(BaseCommand):
             "(use multiple ports to start multiple servers)",
         )
 
-        parser.add_argument(
-            "--nokeepalive",
-            action="store_true",
-            dest="no_keep_alive",
-            help="Tells Tornado to NOT keep alive http connections.",
-        )
-
-        parser.add_argument(
-            "--noxheaders",
-            action="store_false",
-            dest="xheaders",
-            help="Tells Tornado to NOT override remote IP with X-Real-IP.",
-        )
-
     def handle(self, addrport: str, **options: bool) -> None:
         interactive_debug_listen()
 
@@ -80,9 +66,6 @@ class Command(BaseCommand):
         if not addr:
             addr = "127.0.0.1"
 
-        xheaders = options.get("xheaders", True)
-        no_keep_alive = options.get("no_keep_alive", False)
-
         if settings.DEBUG:
             logging.basicConfig(
                 level=logging.INFO, format="%(asctime)s %(levelname)-8s %(message)s"
@@ -115,9 +98,7 @@ class Command(BaseCommand):
                     zulip_autoreload_start()
 
                 # start tornado web server in single-threaded mode
-                http_server = httpserver.HTTPServer(
-                    application, xheaders=xheaders, no_keep_alive=no_keep_alive
-                )
+                http_server = httpserver.HTTPServer(application, xheaders=True)
                 http_server.listen(port, address=addr)
 
                 from zerver.tornado.ioloop_logging import logging_data