Update Readme/Changelog for release

* Change the clearly outdated things in the README file
* Update Changelog with the release date/version
Update Glance pin and configs for Juno

Move all Swift info to the bottom of the DEFAULT options section

Because there is now a glance_store section, having that in the middle of the
swift store conditional caused the filesystem options to be moved out of
the DEFAULT scope. This makes sure everything is in the right section.