vr: fix password server run with empty gateway in isolated netw… (#3943)

Author: ustcweizhou

systemvm/debian/opt/cloud/bin/cs/CsAddress.py

@@ -583,9 +583,9 @@ def post_config_change(self, method):
                         CsPasswdSvc(self.address['public_ip']).stop()
                 elif cmdline.is_master():
                     if method == "add":
-                        CsPasswdSvc(self.address['gateway'] + "," + self.address['public_ip']).start()
+                        CsPasswdSvc(self.get_gateway() + "," + self.address['public_ip']).start()
                     elif method == "delete":
-                        CsPasswdSvc(self.address['gateway'] + "," + self.address['public_ip']).stop()
+                        CsPasswdSvc(self.get_gateway() + "," + self.address['public_ip']).stop()
 
         if self.get_type() == "public" and self.config.is_vpc() and method == "add":
             if self.address["source_nat"]: