Add spice agent client support

Registered by Dongcan Ye

Nova supports spice web client, we can use spice HTML5 console proxy to access instance.
In desktop cloud scenario, usually use a box to access instance, we need to directly access instance via spice_server_ip:port like spice://100.100.1.2:5902

We can adds to support get instance's spice address.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Dongcan Ye
Direction:
Needs approval
Assignee:
Dongcan Ye
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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