Add releasenotes for baremtal tests removal

Patch - Id518a6d87d0949737cd1c50cb6a83149b85e5f85
remove the baremetal tests from tempest.

This patch adds release notes which got missed in
previous patch.

Change-Id: Iba3b613aa7bd00abdada7e503c366acc7a12e19d
diff --git a/releasenotes/notes/remove-baremetal-tests-65186d9e15d5b8fb.yaml b/releasenotes/notes/remove-baremetal-tests-65186d9e15d5b8fb.yaml
new file mode 100644
index 0000000..ca2635e
--- /dev/null
+++ b/releasenotes/notes/remove-baremetal-tests-65186d9e15d5b8fb.yaml
@@ -0,0 +1,4 @@
+---
+upgrade:
+  - All tests for the Ironic project have been removed from Tempest. Those
+    exist as a Tempest plugin in the Ironic project.