Release ovsdbapp for stable/wallaby

$ git log --no-merges --oneline 1.9.0...8304251
8304251 Actually close the connection in Connection.stop()
66918f9 Don't spam retries 100s of times a second
d0cc492 Add an active wait in the "Backend.lookup"
007c0f6 Fix docs job
f6a19a3 Update TOX_CONSTRAINTS_FILE for stable/wallaby
875be60 Update .gitreview for stable/wallaby

Change-Id: I7b6ff4c1f3c539eb4f82ce8a0f66e87f6c531b58

deliverables/wallaby/ovsdbapp.yaml

@@ -18,6 +18,10 @@ releases:
     projects:
       - repo: openstack/ovsdbapp
         hash: 38a99c79087e9279e1bdbda38e12bdc61468a1dc
+  - version: 1.9.1
+    projects:
+      - repo: openstack/ovsdbapp
+        hash: 83042517857c0b00aea572fa8d224416692a2213
 branches:
   - name: stable/wallaby
     location: 1.9.0