Change DVD ISO name and SHA256 sum since we're using the RC1 ISO instead of the beta.
Don't install any packages for RHEL7; RHEL7 doesn't do package installs without a liscense from Red Hat.
Call a few shell provisioning scripts to set up the Vagrant user account and install the VirtualBox guest additions.
Merge branch 'master' of github.com:nickchappell/packer-templates