Support initiative action selecting in start_action method of scheduler module

Registered by Yanyan Hu

Currently, Senlin scheduler only passively accepts request from engine to schedule specified actions. However, it should also have the ability to initiatively pick up a suitable action in READY status for scheduling. To provide this support, we need to extend current design of start_action method in scheduler module to enable initiative action selecting.

Blueprint information

Status:
Complete
Approver:
Qiming Teng
Priority:
High
Drafter:
Yanyan Hu
Direction:
Approved
Assignee:
Yanyan Hu
Definition:
Approved
Series goal:
Accepted for mitaka
Implementation:
Implemented
Milestone target:
None
Started by
Qiming Teng
Completed by
Qiming Teng

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Gerrit topic: https://review.openstack.org/#q,topic:bp/support-initiative-action-selecting-in-start-action,n,z

Addressed by: https://review.openstack.org/244026
    [WIP]Enable initiative action selecting in start_action

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