Define v2 encryption_types_client as library

Migrate v2 API encryption_types_client to tempest.lib.

Partially implements blueprint consistent-service-method-names

Change-Id: Id3b41db66626cda2a50bf406fe4d6cff085c8dbf
diff --git a/releasenotes/notes/add-volume-clients-as-a-library-d05b6bc35e66c6ef.yaml b/releasenotes/notes/add-volume-clients-as-a-library-d05b6bc35e66c6ef.yaml
index 1ef2b0d..4886f16 100644
--- a/releasenotes/notes/add-volume-clients-as-a-library-d05b6bc35e66c6ef.yaml
+++ b/releasenotes/notes/add-volume-clients-as-a-library-d05b6bc35e66c6ef.yaml
@@ -7,6 +7,7 @@
     any maintenance changes.
 
     * encryption_types_client (v1)
+    * encryption_types_client (v2)
     * qos_clients (v1)
     * qos_clients (v2)
     * snapshots_client (v1)