QConf

Change shared memory key
Reduce the space occupied by gdbm dumps
Ensure the consistency during receiving data from zookeeper

• Compatible with PHP 7.0+.
• Compatible with Python 3.
• Improve reading performance (MUST DELETE SHARED MEMORY DUE TO FORMAT HAS CHANGED).
• Support using domain name as zookeeper server's configuration item.
• Fix problem of registering ephemeral node after quick restart.
• Support LRU cache of shared memory.
• Add shared memory configuration item.
• 兼容PHP 7.0+
• 兼容Python 3
• 提高了配置项读取速度(由于共享内存格式改变，使用该版本必须删除旧的共享内存）
• 支持使用zookeeper服务器域名配置QConf
• 解决了agent快速重启可能注册不上临时节点问题
• agent共享内存添加了LRU缓存
• 可以通过配置项设置共享内存大小

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