ci: add Zuul configuration

Add basic check tasks for Zuul.

Add git review configuration.

Pull in PEP8 related fixes,

Co-Authored-By: Nikolay Vinogradov <nikolay.vinogradov@canonical.com>
Change-Id: If40926f8c71541d954056a5b275e1283c5ce85ae

.gitreview

@@ -0,0 +1,5 @@
+[gerrit]
+host=review.opendev.org
+port=29418
+project=openstack/charm-cinder-infinidat.git
+defaultbranch=main

.zuul.yaml

@@ -0,0 +1,4 @@
+- project:
+    templates:
+      - openstack-python3-charm-yoga-jobs
+      - openstack-cover-jobs

tests/tests.py

@@ -16,18 +16,15 @@
 
 """Encapsulate cinder-infinidat testing."""
 
-import zaza.charm_lifecycle.utils as lifecycle_utils
 import zaza.openstack.utilities.openstack as openstack
-import zaza.openstack.utilities.generic as generic
 from zaza.openstack.charm_tests.cinder_backend.tests import CinderBackendTest
 
 from zaza.openstack.charm_tests.cinder.tests import CinderTests
-
-
-import zaza.model as zaza_model
+import cinderclient.exceptions as cinder_exceptions
 
 BACKEND_NAME = 'cinder-infinidat'
 
+
 def configure_default_volume_type():
 
     session = openstack.get_overcloud_keystone_session()
@@ -43,6 +40,7 @@ def configure_default_volume_type():
     except cinder_exceptions.NotFound:
         raise
 
+
 class CinderInfinidatBackendTest(CinderBackendTest):
     """Encapsulate Infinidat tests."""
 
@@ -59,6 +57,7 @@ class CinderInfinidatBackendTest(CinderBackendTest):
     def test_create_volume(self):
         return super().test_create_volume()
 
+
 class CinderInfinidatTest(CinderTests):
     """
     Re-use most relevant existing Cinder tests,
@@ -70,5 +69,3 @@ class CinderInfinidatTest(CinderTests):
 
     def test_900_restart_on_config_change(self):
         return
-
-