Add image-list filter for multihash

This was missed when multihash support was added to the glanceclient.
The os_hash_value is an indexed field in the API.

Includes a release note.

Closes-bug: #1788271

Change-Id: Ibfe28b8c644967b7e0295dfd3f55c3ae1b0cbb2d

releasenotes/notes/multihash-filter-ef2a48dc48fae9dc.yaml

@@ -0,0 +1,13 @@
+---
+features:
+  - |
+    For parity with the old ``checksum`` field, this release adds the
+    ability for CLI users to filter the image list based upon a particular
+    multihash value using the ``--hash <HASH_VALUE>`` option.  Issue the
+    command:
+
+    .. code-block:: none
+
+        glance help image-list
+
+    for more information.