Re-enable flake8-import-order for tox pep8

The switch to pre-commit in I7dd14b4087d
disabled this for tox -e pep8, removing tests
such as I201.

Change-Id: Ic2ea5f672b8c865f33dc6842971956ff7858809e
Signed-off-by: Eric Harney <eharney@redhat.com>

.pre-commit-config.yaml

@@ -25,7 +25,7 @@ repos:
     rev: 8.0.0
     hooks:
       - id: hacking
-        additional_dependencies: []
+        additional_dependencies: ["flake8-import-order~=0.19.2"]
         exclude: '^(doc|releasenotes|tools)/.*$'
   - repo: https://github.com/PyCQA/doc8
     rev: v2.0.0

cinder/tests/unit/volume/drivers/netapp/dataontap/test_block_cmode.py

@@ -20,6 +20,7 @@ from unittest import mock
 from unittest.mock import patch
 
 import ddt
+from oslo_utils import units
 
 from cinder import exception
 from cinder.objects import fields
@@ -42,7 +43,6 @@ from cinder.volume.drivers.netapp.dataontap.utils import loopingcalls
 from cinder.volume.drivers.netapp.dataontap.utils import utils as dot_utils
 from cinder.volume.drivers.netapp import utils as na_utils
 from cinder.volume import volume_utils
-from oslo_utils import units
 
 
 @ddt.ddt