Deprecate import_image

This option was added because of a known issue in WSGI mode[1] which
was fixed during Vicotria release. Now the latest tempest supports Zed
and later we can start removing the option.

[1] https://bugs.launchpad.net/glance/+bug/1888713

Change-Id: Id75c7f5846575fba7e2494bc3182ce65b0892c47
diff --git a/releasenotes/notes/deprecate-import_image-e8c627aab833b64d.yaml b/releasenotes/notes/deprecate-import_image-e8c627aab833b64d.yaml
new file mode 100644
index 0000000..d408538
--- /dev/null
+++ b/releasenotes/notes/deprecate-import_image-e8c627aab833b64d.yaml
@@ -0,0 +1,12 @@
+---
+upgrade:
+  - |
+    Default value of the ``[image-feature-enabled] image_import`` has been
+    changed from ``False`` to ``True``, and now the image import feature is
+    tested by default.
+
+deprecations:
+  - |
+    The ``[image-feature-enabled] image_import`` option has been deprecated.
+    The image import feature works in both standalone mode and WSGI mode since
+    Victoria and the image import feature can be always tested.