Release python-{trove|watcher|zun}client

These releases pick up rst formatting changes that were preventing
python-openstackclient from using autoprogram-cliff to generate plugin
documentation -- see the related story/task and dependant patch.

The changes are bugfix-level, but these are the first ussuri releases so
per standard procedure we're bumping the minor version to leave room for
backports.

Needed-By: https://review.opendev.org/690387

Change-Id: Ib121130f198d3f4cbd76b73e3202562470fca1dc
Story: #1735016
Task: #37241

deliverables/ussuri/python-troveclient.yaml

@@ -6,3 +6,8 @@ team: trove
 type: client-library
 repository-settings:
   openstack/python-troveclient: {}
+releases:
+  - version: 3.1.0
+    projects:
+      - repo: openstack/python-troveclient
+        hash: 5f0271a735516d9c9b30a730fecf4738bafa6cde

deliverables/ussuri/python-watcherclient.yaml

@@ -6,3 +6,8 @@ team: watcher
 type: client-library
 repository-settings:
   openstack/python-watcherclient: {}
+releases:
+  - version: 2.5.0
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: 0c7e3066421cb9201ef5f764cdf24ce28a9c888a

deliverables/ussuri/python-zunclient.yaml

@@ -6,3 +6,8 @@ team: zun
 type: client-library
 repository-settings:
   openstack/python-zunclient: {}
+releases:
+  - version: 3.6.0
+    projects:
+      - repo: openstack/python-zunclient
+        hash: ca5fbb575a612dd3b09466709763afd6240a7bfc