Filter images list by public=True|False

When running the image-list command the user should have the option
to list images according to whether or not the image is was set
to public.  A new test is included to verify this behavior.

Change-Id: If645e7390fcf850648cda780a04ea37a26d855a2
Fixes bug: 1118799
Merge "Filter images list by public=True|False"