Support Multiple SR on XenServer

Registered by Seyeong Kim

now nova-compute can support only one SR on XenServer

make it support multiple SR

- periodicaly update information for multiple SR
- _find_sr method for multiple SR
- db scheme change if needed

Blueprint information

Status:
Complete
Approver:
Vish Ishaya
Priority:
Undefined
Drafter:
Seyeong Kim
Direction:
Needs approval
Assignee:
Seyeong Kim
Definition:
Obsolete
Series goal:
None
Implementation:
Not started
Milestone target:
None
Completed by
John Garbutt

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