Remove usage of six library

Registered by xuanyandong

The Python 2.7 Support has been dropped since Ussuri (*1).
Then replace usage of six (a Python 2 and 3 compatibility library) with code for Python 3.

Blueprint information

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

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.opendev.org/#/q/topic:bp/six-removal

Addressed by: https://review.opendev.org/755147
    Remove six

This doesn't need to be a blueprint.

(?)

Work Items

This blueprint contains Public information 
Everyone can see this information.

Subscribers

No subscribers.