openstack--接口添加以及RPC调用

本篇介绍自己在openstack代码开发中如何添加相应的接口的，以便后续再次用到的时候作为参考

1. URL接口设计的形式为：

POST http://192.168.117.156/compute/v2.1/servers/95322d5e-6b98-4380-a5e0-0cfbd8825662/action
content-type:application/json
User-Agent:python-novaclient
X-Auth-Token:gAAAAABfFUsLXgejkDu2tFguIXuZOxxiyFd2rJL3gxr_GOMp9_b0IbRFi44F1-6Qk8j91JOw2KvCezZH3B1U7VtiP_Q5p566gvMs4uUMwSi9WZAUI3D0aGmu08eTdnr7U4vn64VOUEOA7rw6UNqYvY0s5F4aCjZ4fkEmXfKYG_dX53VZCx5S5nY

{
    "backup-restore":{
        "backupRef":"backup-uuid"
    }
}

2. 添加restore_backup.py文件，nova/api/openstack/compute/restore_backup.py

from webob import exc
from oslo_log import log as logging
from nova.api.openstack import common
from nova.api.openstack import wsgi
from nova.compute import api as compute
from nova import exception
from nova.policies import restore_backup as restore_backup_policies
from nova import objects
import webob
from webob import exc
from nova import