End support for stable/ussuri

This marks the end of support for stable/ussuri
which is EM now[1]. This remove the stable/ussuri
jobs which are failing due to bug#1968798 and also
adds relesenote to mark the end of support of Ussuri.

[1] https://releases.openstack.org/

Change-Id: Ieeb4da8859d44470c5cb67a62f2dcfd7786daf3a
diff --git a/releasenotes/notes/end-of-support-for-ussuri-68583f47805eff02.yaml b/releasenotes/notes/end-of-support-for-ussuri-68583f47805eff02.yaml
new file mode 100644
index 0000000..1a750d9
--- /dev/null
+++ b/releasenotes/notes/end-of-support-for-ussuri-68583f47805eff02.yaml
@@ -0,0 +1,13 @@
+---
+prelude: |
+    This is an intermediate release during the Zed development cycle to
+    mark the end of support for EM Ussuri release in Tempest.
+    After this release, Tempest will support below OpenStack Releases:
+
+    * Yoga
+    * Xena
+    * Wallaby
+    * Victoria
+
+    Current development of Tempest is for OpenStack Zed development
+    cycle.