Add support for "more actions"

Registered by hongbin

In compute panel, there is a "more action" button that allows batch operating on a set of nova instances. It would be helpful to introduce such button to Zun to allow batch operating on containers.

Blueprint information

Status:
Not started
Approver:
hongbin
Priority:
Medium
Drafter:
hongbin
Direction:
Approved
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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