feat(config): enable port dynamique assignment

[jqueguiner]

• still allow the user to define custom port as before
• default port (when not defined) remains the same (50050)
• if port_number is defined but is already in use we are assigning another port automagically
• if port_number is not defined and the default (50050) is already in use we are assigning another port automagically

[jqueguiner]

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[jqueguiner]

@microsoft-github-policy-service agree [company="Gladia"]

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[jeffra]

Thank you @jqueguiner! It looks like our formatter is failing, can you apply the formatter? Details here: https://github.com/microsoft/DeepSpeed-MII/blob/main/CONTRIBUTING.md#prerequisites

[mrwyattii]

I don't think this PR will completely solve the problem for multi-GPU setups. We expect the ports in range [port_number, port_number + num_gpu] to be open:
https://github.com/microsoft/DeepSpeed-MII/blob/747072b08a94129eb1a5d88bbaffa574b7bf039f/mii/server_client.py#L242

Perhaps we need to rethink how we are doing port numbers and find num_gpu open ports in the config.

[mrwyattii]

This PR is failing due to re-initializing the MIIConfig object in server.py and client.py. The changes here will be included as part of the MII Config refactor in #218. This PR should be closed after #218 is merged.