accept integer port

Author: michiya

sql_server/pyodbc/client.py

@@ -28,7 +28,7 @@ def runshell(self):
             args = [self.executable_name]
             if server:
                 if port:
-                    server = ','.join((server, port))
+                    server = ','.join((server, str(port)))
                 args += ["-S", server]
             if user:
                 args += ["-U", user]