Deprecate image v1 service clients

Glance has removed the image v1 APIs in Victoria
cycle: https://review.opendev.org/c/openstack/glance/+/738673

Tempest still support Ussuri release which is last release
where image v1 APIs are present so we need to keep them until
stable ussuri is supported in Tempest but we can deprecate them.

Change-Id: Iabc02c4516c84b523c61b82a2a44ee0db73f21e4
diff --git a/releasenotes/notes/deprecate-image-v1-service-clients-d12ed42210bb76b5.yaml b/releasenotes/notes/deprecate-image-v1-service-clients-d12ed42210bb76b5.yaml
new file mode 100644
index 0000000..4a22f8e
--- /dev/null
+++ b/releasenotes/notes/deprecate-image-v1-service-clients-d12ed42210bb76b5.yaml
@@ -0,0 +1,6 @@
+---
+deprecations:
+  - |
+    Tempest service clients for image v1 APIs (tempest.lib.services.image.v1 module)
+    is deprecated and will be removed once Tempest stop supporting stable Ussuri release
+    which is last release Image v1 APIs are present in glance.