Enhance the libvirt image cache management by cleaning the unused image cache for eph and swap disk and lock method

Registered by jichenjc

According to https://bugs.launchpad.net/nova/+bug/1253991, I think it would be better to use a bp instead of a bug fix
some enhancement that I want to address in steps
1) to do image cache management for swap disk, to remove the cache if it's not used anymore for long time
2) to do image cache management for eph disk, like swap disk
3) some log enhancement for periodic task lead to error logs (like https://bugs.launchpad.net/nova/+bug/1261442 does)

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

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If you are still working on this, please re-submit via nova-specs. If not, please mark as obsolete, and add a quick comment to describe why. --johnthetubaguy (20th April 2014)

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