Cleanup unused helpers

Registered by zhufl on 2019-08-13

Some helpers are never used from the day they are created, and some helpers are no longer used after some commit. These unnecessary helpers should be cleaned up to reduce the lines of the whole code, thus to make the code easier to read and maintain.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
zhufl
Direction:
Needs approval
Assignee:
zhufl
Definition:
Obsolete
Series goal:
None
Implementation:
Started
Milestone target:
None
Started by
zhufl on 2019-08-13
Completed by
zhufl on 2019-08-14

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Gerrit topic: https://review.opendev.org/#/q/topic:bp/cleanup-unused-helpers

Addressed by: https://review.opendev.org/676127
    [Trivial]Remove unused helpers

Addressed by: https://review.opendev.org/676130
    [Trivial]Remove never used helpers

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