Can't synchronize subscription

You can't synchronize the subscription between sites because when the config importer goes to import it a second time, Brightcove fails with a 404 that the subscription already exists. This hard failure prevents further synchronization. When syncing the configuration or installing a new site, it exists from the previous configuration, and thus shouldn't be a hard failure. One possible solution, provided as a patch here, is just to remove the existing subscription endpoint before creating a new one. Another possible solution is to catch the 404 and fail more gracefully. I did not do that solution, because I'm not sure what else can cause a 404, and I didn't want to look at string text to find the exact error.