def delete_role_instances(self, service_name, deployment_name,
role_instance_names):
'''
Reinstalls the operating system on instances of web roles or worker
roles and initializes the storage resources that are used by them. If
you do not want to initialize storage resources, you can use
reimage_role_instance.
service_name:
Name of the hosted service.
deployment_name:
The name of the deployment.
role_instance_names:
List of role instance names.
各位大神好！！
这个方法为什么不行啊？?
