This allows someone to (for example) pass the following environment
variables:
NVIDIA_VISIBLE_DEVICES_0="0,1"
NVIDIA_VISIBLE_DEVICES_1="2,3"
NVIDIA_VISIBLE_DEVICES_WHATEVER="4,5"
and have the nvidia-container-toolkit automatically merge these into:
NVIDIA_VISIBLE_DEVICES="0,1,2,3,4,5"
This is useful (for example) if the full list of devices comes
from multiple, disparate sources.
Note: This will override whatever the original value of
NVIDIA_VISIBLE_DEVICES was (*excluding* its original value) if it also
exists as an environment variable already. We exclude the original value
to ensure that we have a way to override the default value of
NVIDIA_VISIBLE_DEVICES set to "all" inside a container image.
Signed-off-by: Kevin Klues <kklues@nvidia.com>
