Remove usage of six library

Registered by Hongtao Qi

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:
eyal
Priority:
Undefined
Drafter:
Hongtao Qi
Direction:
Needs approval
Assignee:
None
Definition:
Approved
Series goal:
Proposed for victoria
Implementation:
Implemented
Milestone target:
None
Started by
Hongtao Qi
Completed by
Hongtao Qi

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