Add reno for removing Cinder v1 API tests

Cinder v1 API tests have been removed since the commit
I04de2d90fe11f8ec4acbfa983bc0ad3aa979f45b
Then this patch adds the corresponding reno.

Change-Id: I7cab71962ed33c196ef2c00825bfcc4f2917398e
diff --git a/releasenotes/notes/remove-cinder-v1-api-tests-71e266b8d55d475f.yaml b/releasenotes/notes/remove-cinder-v1-api-tests-71e266b8d55d475f.yaml
new file mode 100644
index 0000000..710ad9e
--- /dev/null
+++ b/releasenotes/notes/remove-cinder-v1-api-tests-71e266b8d55d475f.yaml
@@ -0,0 +1,5 @@
+upgrade:
+  - Remove Cinder v1 API tests.
+    Cinder v1 API has been deprecated since Juno release, and Juno is
+    not supported by current Tempest. Then Cinder v1 API tests are
+    removed from Tempest.