pool name can not specified

[shuxiao9058]

as describe below

pool specify a custom name for the connection pool being used. If omitted, then the connection pool name will be generated from the string template ":" or "".

with pool name, cosocket will use a shared connection pool, but slots related specify different Redis node, rather per host & port .

[shuxiao9058]

refer: https://github.com/openresty/lua-nginx-module#tcpsockconnect