Correct API reference link in image client

Some API reference links in image client are invalid now, this
is to change to the current link.

Change-Id: I4e44a25287b1c413ba7fee1e3a3a79e60125d919
diff --git a/tempest/lib/services/image/v1/images_client.py b/tempest/lib/services/image/v1/images_client.py
index 03f4c4b..faafb4a 100644
--- a/tempest/lib/services/image/v1/images_client.py
+++ b/tempest/lib/services/image/v1/images_client.py
@@ -61,7 +61,7 @@
 
         For a full list of available parameters, please refer to the official
         API reference:
-        http://developer.openstack.org/api-ref-image-v1.html#createImage-v1
+        https://developer.openstack.org/api-ref/image/v1/index.html#create-image
         """
         if headers is None:
             headers = {}
@@ -79,7 +79,7 @@
 
         For a full list of available parameters, please refer to the official
         API reference:
-        http://developer.openstack.org/api-ref-image-v1.html#updateImage-v1
+        https://developer.openstack.org/api-ref/image/v1/index.html#update-image
         """
         if headers is None:
             headers = {}