Comment 1 for bug 1502291

We want to provide users the safest upgrade path from one release to another as such we going to keep it so that the '-d' switch will only take you to the development release of Ubuntu if you are running the release immediately before the development one. If testers want to test the upgrade path described in the description, from Trusty to Wily, then they can create a local version of the meta-release-development file with the desired from and to releases.