Release mistral-lib for wallaby-1 milestone

This is a library release for mistral-lib for the wallaby-1
milestone. This repo includes commits that have not been releases for
this cycle yet.

If the team is ready to process with this release, please leave a +1
to indicate we should go ahead with the release.

If the team needs more time for things about to merge, or if there is
some other reason a release should not be done at this time, please
leave a -1 with a comment indicating the status. Then update the patch
with the new commit hash to use once the team is ready to do the
release.

Change-Id: Iebd9f6116b7fdd1d0c61a1d442203b87decf00ce

deliverables/wallaby/mistral-lib.yaml

@@ -6,3 +6,8 @@ team: mistral
 type: library
 repository-settings:
   openstack/mistral-lib: {}
+releases:
+  - version: 2.4.0
+    projects:
+      - repo: openstack/mistral-lib
+        hash: 95724c5ad0d249e8774d12c306c89dba000e2d33