Update to prevent useradd not unique uid error

[Matulis]

Testing on fedora and arch linux led to the following error:

useradd: UID 0 is not unique
The command '/bin/sh -c /bin/bash; useradd --uid $UID build' returned a non-zero code: 4
Makefile:18: recipe for target '/home/chief/nvidia-docker/tools/bin' failed

This allows for duplicate uid, which seems to be the same as current user(root=0), so that the following build steps succeed

[flx42]

Fixed myself because the issue was blocking other users, thanks for reporting and suggesting a fix!
Did you try on fedora and arch linux? We would love to get some feedback!

[Matulis]

No I couldn't get it working on arch, I was getting the following error:

Error: failed to retrieve CPU affinity

Any ideas? Docker in debug mode didn't seem to offer more information and I haven't had time to dig into it

[3XX0]

Looks like an issue on our end.
I think it is fixed for nvidia-docker now but not for nvidia-docker-plugin