descriptive log info for port in use and port-retries=0

notebook/notebookapp.py

@@ -1490,10 +1490,13 @@ class NotebookApp(JupyterApp):
                 self.http_server.listen(port, self.ip)
             except socket.error as e:
                 if e.errno == errno.EADDRINUSE:
-                    self.log.info(_('The port %i is already in use, trying another port.') % port)
+                    if self.port_retries:
+                        self.log.info(_('The port %i is already in use, trying another port.') % port)
+                    else:
+                        self.log.info(_('The port %i is already in use.') % port)
                     continue
                 elif e.errno in (errno.EACCES, getattr(errno, 'WSAEACCES', errno.EACCES)):
-                    self.log.warning(_("Permission to listen on port %i denied") % port)
+                    self.log.warning(_("Permission to listen on port %i denied.") % port)
                     continue
                 else:
                     raise