Fix reference to information model

This fixes a bug where the information model for relations was referred
to as "vca-relations" rather than the proper "vca-relationships".

Change-Id: I3f961ab750df647e2d2086e887d7e9ac0a01c034
Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/tests/integration/test_charm_relate.py b/tests/integration/test_charm_relate.py
index e0f4b65..525fc72 100644
--- a/tests/integration/test_charm_relate.py
+++ b/tests/integration/test_charm_relate.py
@@ -110,7 +110,7 @@
                     juju:
                         charm: proxy-ci
                         proxy: true
-                        vca-relations:
+                        vca-relationships:
                             # Relation needs to map to the vdu providing or
                             # requiring, so that we can map to the deployed app.
                             relation: