Support for kernels with CONFIG_NUMA=n

[Cynede]

this function:

nvidia-docker/tools/src/nvml/nvml.go

Line 149 in 1dff2bb

func numaNode(busid string) (uint, error) {

should return 0,nil if there is no numa

there is no numa when kernel has no numa support (CONFIG_NUMA=n)

when numa is not used all the stuff should be binded to 0 so it's fine