VirtualGL in OOD apps

@tdockendorf Yes, please! We run a general-purpose Slurm cluster that has a mix of CPU and GPU nodes. I have a couple of end-user groups interested in running applications in OOD that needs accelerated OpenGL (specifically, ChimeraX and Napari), and have been racking my brain on how to do it properly.

We are very interested in whatever code/scripts that already exist, as well as any working xorg.conf and other VirtualGL configuration tricks. We successfully tested OOD with VirtualGL and TurboVNC on a dev node a while back, but were worried about having to run a wide-open X server on every GPU node in production, which may have security implications. But, from your description of using cgroups to limit access within a Slurm job, this will alleviate that.

Thanks very much in advance!