Enhancement on prompts to list selected objects.

Used the display name from table.get_object_display(datum), instead
of explicitly looking for the first occurance of table header that
contains 'Name'.

Fallback mode: tables with no valid get_object_display(datum)
won't list selected objects.

Fixes bug 1155821

Change-Id: Iff4ee8500eb57f39a9bcb199c7eb2be7fa3e4ec4
Merge "Enhancement on prompts to list selected objects."