[Fedora Robotics] Bloom gets an RPM generator and using SCLs for ROS

[Ankur Sinha]

Hi,

Looks like someone finished what I'd begun:

https://github.com/ros-infrastructure/bloom/pull/228

I'll test it out ASAP.

Since we're moving towards using SCLs with Fedora.next, I was wondering
if we could use SCLs to provide ROS releases in parallel? What do you
folks think?