Add delete image from specific store API

This patch add delete image from specific store API as in doc [1] and
move create_stage function to image base class
[1] https://docs.openstack.org/api-ref/image/v2/#delete-image-from-store

Change-Id: Ifd07423b5ec3f10e7c21125f52b1ab9e5ed35467
diff --git a/releasenotes/notes/add-delete-image-from-specific-store-api-84c0ecd50724f6de.yaml b/releasenotes/notes/add-delete-image-from-specific-store-api-84c0ecd50724f6de.yaml
new file mode 100644
index 0000000..a8a0b70
--- /dev/null
+++ b/releasenotes/notes/add-delete-image-from-specific-store-api-84c0ecd50724f6de.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Add delete image from specific store API to image V2 client