Product Level Sandbox Setting Bulk Updater

[angelleye]

Previously, we added a product-level option to enable the sandbox so that you can setup individual item(s) to use for testing. We didn't add this setting to our bulk updater tool, though. Typically, this isn't something we'd need to bulk update with, but it would be nice to have just in case the data gets screwy somehow and we need to disable it for all products.

Side note: not sure if that's what's going on with redtagdeal.net right now or not..??