Update image register examples to new behavior

Refs: #4276

docs/collection_of_examples/imageregister.rst

@@ -6,17 +6,18 @@ then is registered to the image service (Plankton). The image location at the
 storage server is unique through out a deployment and also necessary for the
 image to exist.
 
-The image location format::
+The image location format at user level::
 
-    pithos://<user id>/<container>/<object path>
+    <container>:<object path>
 
     e.g.:
 
-    pithos://s0m3-u53r-1d/pithos/debian_base3.diskdump
+    pithos:debian_base3.diskdump
 
 The crussial element in an image location is the container (e.g. `pithos`) and
 the image object path (e.g. `debian_base3.diskdump`).
 
+
 Register an image
 -----------------
 
@@ -58,6 +59,22 @@ Register the image object with the name 'Debian Base Alpha'
     uploads it to the same location as the image. The meta file can be
     downloaded and reused for more image registrations.
 
+Another way to perform the two operations above is to call **/image register**
+with the **\- -upload-image-file** argument. This single operation will upload
+the image file and then register it as an image, and is equivalent to manually
+calling **/file upload** and **/image register**.
+
+In other words, the example that follows is equivalent to calling the two
+operations above.
+
+.. code-block:: console
+
+        [kamaki]: image register 'Debian Base Alpha'
+            pithos:debian_base3.diskdump
+            --upload-image-file='debian_base3.diskdump'
+        [kamaki]:
+
+
 Read the metafile
 
 .. code-block:: console