1.What is the problem?
In nova-apigw, there are some servers with volume attachments
are not implemented:
* List volume attachments for an instance;
* Attach a volume to an instance;
* Show a detail of a volume attachment;
* Update a volume attachment;
* Detach a volume from an instance.
2.What is the solution to the problem?
This patch add three feature:
* We can get the volume identified by the attachment ID.
* We can get a list of all the attacned volumes.
* Detach a volume identified by the attachment ID from
the given server ID.
3.What the features need to be implemented to the Tricircle
to realize the solution?
The above three features.
Change-Id: I76ad72ca5d54fca7c2c463b5c41f2a4151f11eb8
450f4e6531