Remove integrated dashboard tests

Horizon tempest tests are now in a plugin openstack/tempest-horizon
This patch removes the scenario test for the dashboard and the
corresponding configuration values.

Change-Id: I2a69ebed2947a5ab5e5ca79557130bd093e168dd
diff --git a/releasenotes/notes/remove-integrated-horizon-bb57551c1e5f5be3.yaml b/releasenotes/notes/remove-integrated-horizon-bb57551c1e5f5be3.yaml
new file mode 100644
index 0000000..294f6d9
--- /dev/null
+++ b/releasenotes/notes/remove-integrated-horizon-bb57551c1e5f5be3.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - The integrated dashboard scenario test has been
+    removed and is now in a separate tempest plugin
+    tempest-horizon. The removed test coverage can be
+    used by installing tempest-horizon on the server
+    where you run tempest.