volcano-devices unified config

[archlitchi]

/kind feature

/area scheduling

After last Friday's discussion, we decided to use sync.once to initialize device config from configmap once during initializing. This Feature is used combined with latest version of 'https://github.com/Project-HAMi/volcano-vgpu-device-plugin'

This PR exposes vGPU resourceName as #3926 does, Using device--configMap is a better than using scheduler-configmap, since device-config can be accessed by volcano-vgpu-device-plugin.

To be noticed:

1. This feature is fully compatible with earlier versions, a default config will be generated if CM not found.
2. The information got by configs is not processed now, it will be used for future dynamic-mig implementation
3. This PR won't change the behavior of volcano-vgpu feature, dynamic-mig is not implemented in this PR
4. This PR fix issue:We'd better not depend on a kubeconfig file #3473

[volcano-sh-bot]

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