Fix display of images in Rebuild Instance

The image list in Rebuild Instance is constructed from (id, name)
pairs. As the name is a string, the transform function is never called
unless image name is None. In that case it crashes the view.

This change:
  - Builds the image list with (id, image) so the correct thing
      is passed to the transform
  - Corrects the size/name attributes
  - Handles None display name (displays id instead)
  - Set the name of one of the public images in glance_data.py to
      None so errors like these are picked up in the future.

Change-Id: I0d1f8594cccc404c0dd6f254b70d23789817dd06
Closes-bug: #1258349
Django Formset support in DataTable

Add FormsetDataTable and FormsetDataTableMixin classes that allow you
to use a Django Formset with your DataTable, making it possible to edit
the data displayed.

Implements: blueprint formset-data-table

Change-Id: I636fa3ae9847f1700eae0fb5293fa97683ba2218
Merge "Django Formset support in DataTable"
Merge "Fix display of images in Rebuild Instance"