[BUU] Specs for bulk products feature parity

[dacook]

We have tests on the old bulk edit products screen, which we should make sure is covered by the new bulk edit products spec

This would be necessary before removing the admin_style_v3 feature toggle.

As an Administrator
  I want to be able to manage products in bulk
  listing products
    displays a list of products
    displays a message when number of products is zero
    displays a select box for suppliers, with the appropriate supplier selected
    displays an on hand count in a span for each product
    displays 'on demand' for any variant that is available on demand
    displays a select box for the unit of measure for the product's variants
    displays a text field for the item name when unit is set to 'Items'