Upgrade Path from 7.x-1.x to 7.x-2.x via update hook 7200. 

7.x-1.x to 7.x-2.x Upgrade path function. Takes care of renaming fields and content types as well as reverting the feature. Generally changing the machine names is a very bad thing. We are going to take some liberties here. Views and other things like workbench will have to be updated manually as they store machine names and we will not be looking to change them. This is primarily for drupal core only.