设置当前工作进程最大协程数量。超过max_coroutine底层将无法创建新的协程，底层会抛出错误，并直接关闭连接。
在Server程序中实际最大可创建协程数量等于 worker_num * max_coroutine
$server->set(array(
'max_coroutine' => 3000,
))默认值为
3000
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