Remove explicit cinder v3 endpoint test

Cinder now defaults to the v3 API and there are no longer multiple
versions/entrypoints.  This scenario can be deleted as it is now
redundant.

The test began breaking when devstack merged commit
d7c3c0accc89e4e99915c24fa7c3bff2e90a715ea to remove the 'cinderv3'
endpoint in keystone as 'block-storage' now points to the v3 API.

Change-Id: Ia5e045bef8485290fd54be6c8674ac0f0158e98c

rally-jobs/cinder.yaml

@@ -20,24 +20,6 @@
             users:
               tenants: 2
               users_per_tenant: 2
-        -
-          scenario:
-            CinderVolumes.create_volume:
-              size:
-                min: 1
-                max: 2
-          runner:
-            constant:
-              times: 2
-              concurrency: 2
-          contexts:
-            users:
-              tenants: 2
-              users_per_tenant: 2
-            api_versions:
-              cinder:
-                version: 3
-                service_name: cinderv3
         -
           description: "Create a volume from the specified image."
           scenario:

tox.ini

@@ -142,6 +142,8 @@ filterwarnings =
     ignore:::.*requests.*
     # python 3.11
     ignore:'cgi' is deprecated and slated for removal in Python 3.13:DeprecationWarning:
+    ignore:datetime\.datetime\.utcnow\(\) is deprecated.*:DeprecationWarning:
+    ignore:datetime\.datetime\.utcfromtimestamp\(\) is deprecated.*:DeprecationWarning:
     # python 3.10
     ignore:The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives:DeprecationWarning:
     ignore:pkg_resources is deprecated as an API:DeprecationWarning: