Make delete_volume in volumes_client.py use **params

I99f9910f75aef095f2bbb37680ee584e52bf82da introduced a new
kwarg to the delete_volume() method. But the correct way to
do this is to introduce a generic **params argument, so avoid
changing the signature of the method too often.

Change-Id: Ifb6731fd893a32bea6c7832236bb26a2eacaf56c
diff --git a/releasenotes/notes/add-kwargs-to-delete-vol-of-vol-client-1ecde75beb62933c.yaml b/releasenotes/notes/add-kwargs-to-delete-vol-of-vol-client-1ecde75beb62933c.yaml
new file mode 100644
index 0000000..b8c9dfc
--- /dev/null
+++ b/releasenotes/notes/add-kwargs-to-delete-vol-of-vol-client-1ecde75beb62933c.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    The ``delete_volume`` method of the ``VolumesClient`` class
+    now has an additional ``**params`` argument that enables passing
+    additional information in the query string of the HTTP request.
+