Support volcano pytorch plugin

[shinytang6]

What would you like to be added:

As described in https://github.com/volcano-sh/volcano/blob/master/docs/design/distributed-framework-plugins.md, we need to support distributed training plugins in volcano, following plugins have been already supported:

• tensorflow
• mpi

We'd better also support the pytorch plugin.

[shinytang6]

Please take a look at this feature request.
/assign @ccchenjiahuan

[volcano-sh-bot]

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In response to this:

Please take a look at this feature request.
/assign ccchenjiahuan

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[shinytang6]

resolved by PR #2313
/close

[volcano-sh-bot]

@shinytang6: Closing this issue.

In response to this:

resolved by PR #2313
/close

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