add api for geting instance net traffic

Registered by Yaguang Tang

it is issential to monitor the instance net traffic ,so we add a api to get the info include receive and transate Bytes of every net interface .

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Yaguang Tang
Direction:
Needs approval
Assignee:
Yaguang Tang
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Yaguang Tang

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this work can be done by Ceilometer

(?)

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