[Feature] support deploy CurveBS on bcache

[zyb521]

请帮助我们在 bcache 上面部署 CurveBS，如果你想了解更详细的信息或有任何疑问，请在该 issue 下面告诉我。 可能包括：

• bcache后端设备、缓存设备的初始化
• bcache后端与缓存的关联
• bcache默认参数修改
• bcache集群清理，缓存解关联，环境清理

基于curveadm playbook功能实现，我们可以提供部署步骤和部署命令的参考脚本

[saicaca]

Hello, I'd like to work on this feature. Please assign it to me.

[caoxianfei1]

Hello, I'd like to work on this feature. Please assign it to me.

Welcome!