Add filter to image list

* Hides previously broken --page-size option
* Adds --property to image list for filtering on properties
* Adds Visibility, Protected, Owner, Properties/Tags to --long output
* Adds api.utils.simple_filter() for selecting matches out of a list
  of objects
* Adds tests for all of the above
* Updates image docs

There are additional filtering options to be added in later reviews.

Change-Id: I32feff0ad61aae749b33621c817658d7dc90c3aa
Closes-bug: 1401902

doc/source/command-objects/image.rst

@@ -138,14 +138,10 @@ List available images
 .. code:: bash
 
     os image list
-        [--page-size <size>]
-        [--public|--private]
+        [--public | --private | --shared]
+        [--property <key=value>]
         [--long]
 
-.. option:: --page-size <size>
-
-    Number of images to request in each paginated request
-
 .. option:: --public
 
     List only public images
@@ -154,6 +150,16 @@ List available images
 
     List only private images
 
+.. option:: --shared
+
+    List only shared images
+
+    *Image version 2 only.*
+
+.. option:: --property <key=value>
+
+    Filter output based on property
+
 .. option:: --long
 
     List additional fields in output