[nova][ptg]Support volume local cache

Bal√°zs Gibizer balazs.gibizer at est.tech
Fri Nov 8 07:32:47 UTC 2019

spec: https://review.opendev.org/#/c/689070/


LiangFang to update the spec based on the discussion in the room[1]:
* use traits to driver scheduling. The cache is not sliced per instance 
so it cannot be a resource class
* document the alternative between doing a hard scheduling decision or 
only implement caching as a best effort optimization for the guest.
* document the alternative to do the whole cache management on libvirt 
(or QEMU) level

[1] https://etherpad.openstack.org/p/nova-shanghai-ptg

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