Release python-vitrageclient 2.4.0

This is the Stein milestone-1 release for python-vitrageclient to
release merged commits since the last release.

See [1] for more details on the new cycle-with-intermediary library
release changes.

[1] http://lists.openstack.org/pipermail/openstack-dev/2018-October/135689.html

We plan on processing this release November 1 unless we are told to hold
off, or earlier if we get a +1 from the PTL and/or release liaison
indicating that it is all clear to proceed.

Change-Id: I463ca1858050a6875208b320219f9363c10c3395
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

deliverables/stein/python-vitrageclient.yaml

@@ -6,3 +6,8 @@ team: vitrage
 type: client-library
 repository-settings:
   openstack/python-vitrageclient: {}
+releases:
+  - projects:
+      - hash: d04c6617efae4f87664c436a1d7858de3fb0b3f5
+        repo: openstack/python-vitrageclient
+    version: 2.4.0