report host memory and disk information

Registered by Shaoman Zhang on 2016-04-18

Heat need to triger vm autoscale and migration based on host cpu/memory/disk information, for example, a host memory usage is too high, then migrate vms on it.
Currently Nova has provided host cpu information, hope also increase host memory/disk total and used information.

Blueprint information

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

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