Remove six library import and usage from manila/utils.py

[BGj]

manila/utils.py (https://github.com/openstack/manila/blob/45f98a7d0a7d186cd46cd8da40715b87c029fe27/manila/utils.py) is still using the six library (Python 2 and 3 compatibility library). Manila is now using only Python 3 so six library is no longer needed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/manila/+/815136

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/manila/+/815136
Committed: https://opendev.org/openstack/manila/commit/b62081e138e80d5a17ef9495a744ac5869c554e2
Submitter: "Zuul (22348)"
Branch: master

commit b62081e138e80d5a17ef9495a744ac5869c554e2
Author: Besjana Gjika <email address hidden>
Date: Fri Oct 22 15:45:10 2021 +0000

    Deletes the six library and all its usages from manila/utils.py

    The manila/utils.py is still using six library and some of its methods, which are useless as Python 2 is no more used.

    The import of six library and encodeutils from oslo_utils are removed as well as their usage inside the code.

    Closes-Bug: #1948029
    Change-Id: I855022b9bd038449c0eb87868d6cf39413341db0

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/manila 14.0.0.0rc1 release candidate.