Release python-vitrageclient for wallaby-1 milestone

This is a library release for python-vitrageclient 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: I39c87eec9a1f52adb97a0e844b952dfee356b014

deliverables/wallaby/python-vitrageclient.yaml

@@ -6,3 +6,8 @@ team: vitrage
 type: client-library
 repository-settings:
   openstack/python-vitrageclient: {}
+releases:
+  - version: 4.2.0
+    projects:
+      - repo: openstack/python-vitrageclient
+        hash: 3b976540d9ca5881003c3884bed12993d43b00cc