commandserver: use SOMAXCONN as queue size of pending connections

The old value 5 was arbitrary chosen. Since there's no practical reason to
limit the backlog, this patch simply uses SOMAXCONN as a value large enough.

mercurial/commandserver.py

@@ -443,7 +443,7 b' class unixforkingservice(object):'
     def init(self):
         self._sock = socket.socket(socket.AF_UNIX)
         self._servicehandler.bindsocket(self._sock, self.address)
-        self._sock.listen(5)
+        self._sock.listen(socket.SOMAXCONN)
         o = signal.signal(signal.SIGCHLD, self._sigchldhandler)
         self._oldsigchldhandler = o
         self._servicehandler.printbanner(self.address)