Remove /dev bind mount from example

[nixpanic]

There is no need to bind-mount /dev when the container is privileged,
the container runtime provides everything in /dev that Gluster expects.

Fixes: https://bugzilla.redhat.com/1651270

[nixpanic]

See-also: gluster/gluster-kubernetes#538

[SaravanaStorageNetwork]

LGTM

[phlogistonjohn]

I wonder if there are obscure or old runtimes that did not mount /dev automatically for a privleged container. If that's the case perhaps we could add a line to the containers start scripts to refuse to run if it fails to find a populated /dev.
This could possibly be done in a followup.

[humblec]

@SaravanaStorageNetwork @nixpanic Do you guys have any document ( may be from docker itself ?) which kind of explain the behaviour with priviledged and /dev/ access ? If yes, could you please share it ?

[nixpanic]

Unfortunately there does not seem to be a clear description of what 'privileged' really includes. There are differences between Docker and CRI-O features, but I have not found any documentation about 'privileged' in either project.

[phlogistonjohn]

Does it make sense to reach out to the crio project and ask for more detailed descriptions of this behavior? Does that project have a mailing list or maybe we should just create an issue at the cri-o github project? I'd be happy to help if need be.