Remove usage of six library

Registered by Bhagyashri Shewale

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.

*1: https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Blueprint information

Status:
Not started
Approver:
Abhishek Kekane
Priority:
Undefined
Drafter:
Bhagyashri Shewale
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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