Settings extension for Nvidia settings APIs

[monirul]

Issue #, if available:

Description of changes:
This PR contains the settings sdk changes for Nvidia api. In this PR, we have add the settings for settings.nvidia-container-runtime and settings.kubernetes.device-plugin.nvidia.

Testing done:
Yes.

bash-5.1# apiclient set settings.kubernetes.device-plugins.nvidia.pass-device-specs=true
bash-5.1# cat /etc/nvidia-k8s-device-plugin/settings.yaml
version: v1
flags:
  migStrategy: "none"
  failOnInitError: true
  plugin:
    passDeviceSpecs: true
    deviceListStrategy: volume-mounts
    deviceIDStrategy: index
bash-5.1# apiclient set settings.kubernetes.device-plugins.nvidia.device-list-strategy=envvar
bash-5.1# cat /etc/nvidia-k8s-device-plugin/settings.yaml
version: v1
flags:
  migStrategy: "none"
  failOnInitError: true
  plugin:
    passDeviceSpecs: true
    deviceListStrategy: envvar
    deviceIDStrategy: index
bash-5.1# apiclient set settings.kubernetes.device-plugins.nvidia.device-id-strategy=uuid
bash-5.1# cat /etc/nvidia-k8s-device-plugin/settings.yaml
version: v1
flags:
  migStrategy: "none"
  failOnInitError: true
  plugin:
    passDeviceSpecs: true
    deviceListStrategy: envvar
    deviceIDStrategy: uuid

bash-5.1# cat /etc/nvidia-container-runtime/config.toml
accept-nvidia-visible-devices-as-volume-mounts = true
accept-nvidia-visible-devices-envvar-when-unprivileged = false

[nvidia-container-cli]
root = "/"
path = "/usr/bin/nvidia-container-cli"
environment = []
ldconfig = "@/sbin/ldconfig"
bash-5.1# apiclient set settings.nvidia-container-runtime.visible-devices-as-volume-mounts=false
bash-5.1# apiclient set settings.nvidia-container-runtime.visible-devices-envvar-when-unprivileged=true
bash-5.1# cat /etc/nvidia-container-runtime/config.toml
accept-nvidia-visible-devices-as-volume-mounts = false
accept-nvidia-visible-devices-envvar-when-unprivileged = true

[nvidia-container-cli]
root = "/"
path = "/usr/bin/nvidia-container-cli"
environment = []
ldconfig = "@/sbin/ldconfig"

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[cbgbt]

Looks like you may need to run cargo fmt to get the linter to pass.

[cbgbt]

The GitHub actions CI workflow runs make build -- you could use the same target locally to iterate on getting it to pass.

[cbgbt]

I'm overall pretty happy with this, other than some minor suggestions (and of course, getting the build to pass 😄)

[bcressey]

Does device-list-strategy = "volume-mounts" here imply that visible-devices-as-volume-mounts should also be true?

[monirul]

Yes.

[cbgbt]

Looks good to me.