Rather than dublicating code to implement rhel or any
other derivitive, this patch introduces an rpm-distro
element that should be used as a dependency.
Change-Id: I8a92bb041764d03f430b438f0013704f79a8674c
The root user tries to `sudo -u stack`, without a tty,
causing fedora+devstack images builds to fail in Jenkins.
Change-Id: Ia0a7fb315cf9bd17cf250e70dba06363a697c97c