remove the the colorizer.py which hasn't been used 
since https://review.opendev.org/c/openstack/python-cinderclient/+/502120

Change-Id: I9bed2ec947705cd53daa04678093a80581dc3282

We support Python 3.6 as a minimum now, making these checks no-ops.
These file is unused in current project and remove them.

Change-Id: Ie5cbd9653375deeb523190d9c499f0c89c035d2e

This adds the import order extension to match what we have in the cinder
repo. This is a linting extension that will check that imports are in
the correct order and the correct grouping so they automatically get
flagged, and it won't be whether reviewers notice and decide to do
anything or not.

Cinder change was Ic13ba238a4a45c6219f4de131cfe0366219d722f for a little
more wordy reasoning.

Also includes updates for noqa tags. Newer version of the linters appear
to want these on the function definition line, not on the decorator
line.

Change-Id: Ibf3f3afbf3bb6ec6613b35f91d4a353c6a391f41
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

Replace six with Python 3 style code.

Change-Id: I4b97e040f3e790ac114dcd43c68e6b67b1079adf

The current version does not work anymore with the current
testing stack.
Due to the bump, the wrapper needed a few changes
(maybe it could be dropped at some point?

Version 2.3.0 (used by cinder right now) was considered too,
but it requires a specific version of isort:
https://github.com/PyCQA/isort/issues/1273

Change-Id: I07fa32e7f49bde041d101a2d09860d0bc27acda0

The __future__ module [1] was used in this context to ensure compatibility
between python 2 and python 3.

We previously dropped the support of python 2.7 [2] and now we only support
python 3 so we don't need to continue to use this module and the imports
listed below.

Imports commonly used and their related PEPs:
- `division` is related to PEP 238 [3]
- `print_function` is related to PEP 3105 [4]
- `unicode_literals` is related to PEP 3112 [5]
- `with_statement` is related to PEP 343 [6]
- `absolute_import` is related to PEP 328 [7]

[1] https://docs.python.org/3/library/__future__.html
[2] https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html
[3] https://www.python.org/dev/peps/pep-0238
[4] https://www.python.org/dev/peps/pep-3105
[5] https://www.python.org/dev/peps/pep-3112
[6] https://www.python.org/dev/peps/pep-0343
[7] https://www.python.org/dev/peps/pep-0328

Change-Id: Id785793c36b3a6819a7522525252c3fef15ebe2b

We've kept hacking capped for a long time now. This raises the hacking
package version to the latest release and fixes the issues that it
found.

Change-Id: I69e41a340c815090f25677607e971a8e75791f6d
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

On my environment, the cinderclient CLI reports:
/usr/lib/python2.7/site-packages/requests/__init__.py:91:
RequestsDependencyWarning: urllib3 (1.25.6) or
chardet (2.2.1) doesn't match a supported version!

When running any command.

This is fairly irritating to have pop up in the
context of cinder bash-completion calls, i.e.,
when you hit tab after "cinder" at the shell.

Just hide errors there rather than pollute the
screen with them.

Change-Id: I40019dcc845015de8cfe8165656829cdaa446666