[ops] support list objects for all users or the one by user id

Registered by Kun Huang

nova should support list some objects via users, for example:

nova keypair-ist --user-id xxxx

This is friendly to ops :)

The related bug is https://bugs.launchpad.net/nova/+bug/1182965

Blueprint information

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

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