Release python-keystoneclient 3.19.1 for stable/stein

This release would include [1], which makes life easier for packagers
who want to run unit tests.

[1] - https://review.opendev.org/701425

Change-Id: I30eff07200e674f664b2139e0065c3aba494e527

deliverables/stein/python-keystoneclient.yaml

@@ -15,6 +15,10 @@ releases:
       - hash: 6c4bb8b529edc2e619fdda212f21dca8160decad
         repo: openstack/python-keystoneclient
     version: 3.19.0
+  - projects:
+      - hash: abe757aa70b262068f26b2b634b8fff06a8fbfdf
+        repo: openstack/python-keystoneclient
+    version: 3.19.1
 branches:
   - location: 3.19.0
     name: stable/stein