Switch to cinder v3 API

The Block Storage API v2 has been removed in xena release.

Related-Prod: PRODX-28762
Change-Id: Ib74b36c10724cae34989f3ed7183dc19a7e4e47e
diff --git a/heat_tempest_plugin/services/clients.py b/heat_tempest_plugin/services/clients.py
index d6e1dfb..ae4cbe2 100644
--- a/heat_tempest_plugin/services/clients.py
+++ b/heat_tempest_plugin/services/clients.py
@@ -62,7 +62,7 @@
     calling various OpenStack APIs.
     """
 
-    CINDERCLIENT_VERSION = '2'
+    CINDERCLIENT_VERSION = '3'
     HEATCLIENT_VERSION = '1'
     NOVA_API_VERSION = '2.1'
     GNOCCHI_VERSION = '1'