add fixtypo test=develop

python/paddle_serving_server/__init__.py

@@ -375,7 +375,7 @@ class Server(object):
         os.system("touch {}/fluid_time_file".format(workdir))
 
         if not self.port_is_available(port):
-            raise SystemExit("Prot {} is already used".format(port))
+            raise SystemExit("Port {} is already used".format(port))
         self.set_port(port)
         self._prepare_resource(workdir)
         self._prepare_engine(self.model_config_paths, device)

python/paddle_serving_server_gpu/__init__.py

@@ -410,7 +410,7 @@ class Server(object):
         os.system("touch {}/fluid_time_file".format(workdir))
 
         if not self.port_is_available(port):
-            raise SystemExit("Prot {} is already used".format(port))
+            raise SystemExit("Port {} is already used".format(port))
 
         self.set_port(port)
         self._prepare_resource(workdir)