Add FilterScheduler for dhcp_agent_scheduler

Registered by ZhiQiang Fan

Currently, the dhcp_agent_scheduler only support ChanceScheduler, i think it will be good to add a FilterScheduler for it, the FilterScheduler will schedule dhcp agent according to their current load (and/or other conditions), and will return top list of most light-weight agents

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
ZhiQiang Fan
Definition:
Superseded
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Armando Migliaccio

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Whiteboard

https://blueprints.launchpad.net/oslo/+spec/common-filters, the status of scheduler module in oslo is `Orphan`

(?)

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