Fix expected response code of show_image_file

According to https://developer.openstack.org/api-ref/image/v2/#download-binary-image-data,
normal response codes of interface show_image_file should
be [200, 204, 206], this is to fix it.

Change-Id: I6eef7231742d873a0e727c300a9ae7f5958ac4f8
Closes-Bug: #1756264
diff --git a/releasenotes/notes/fix-show-image-file-expected-code-92d97342d0f6d60e.yaml b/releasenotes/notes/fix-show-image-file-expected-code-92d97342d0f6d60e.yaml
new file mode 100644
index 0000000..a4050a5
--- /dev/null
+++ b/releasenotes/notes/fix-show-image-file-expected-code-92d97342d0f6d60e.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix show_image_file interface in v2 ImagesClient: Bug#1756264.
+    The expected success code of show_image_file is changed from
+    ``200`` to ``[200, 204, 206]``.