Release python-barbicanclient for wallaby

Propose a release for python-barbicanclient for Wallaby, even if no change really
warrants it, as we need a tag to start the stable branch from.

$ git log --oneline --no-merges 5.0.1..ad49c40
b46836e bump py37 to py38 in tox.ini
2c563d5 Add Python3 wallaby unit tests
c663fd2 [goal] Migrate tox based testing to ubuntu focal

Signed-off-by: Thierry Carrez <thierry@openstack.org>
Change-Id: Ief8b3429abda6cec29108dfca3bf71fb7ba37150

deliverables/wallaby/python-barbicanclient.yaml

@@ -5,3 +5,11 @@ team: barbican
 type: client-library
 repository-settings:
   openstack/python-barbicanclient: {}
+releases:
+  - version: 5.1.0
+    projects:
+      - repo: openstack/python-barbicanclient
+        hash: ad49c406fe67459a4a667c78ad37782fb14bdbb7
+branches:
+  - name: stable/wallaby
+    location: 5.1.0