Fixes _compute_nproc_per_node in case of bad dist configuration
#2288
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Description: - Now uses new gloo group to compute nproc per node - Context: using NCCL and if user badly setups cuda per proc, idist will hang on _compute_nproc_per_node - Here is an example: https://app.circleci.com/pipelines/github/pytorch/ignite/2264/workflows/2e3073fd-0859-41c7-91e8-eef0f8eabee2/jobs/7060?invite=true#step-107-872 - However, I couldn't repro the issue on my setup cc @sdesrozier
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Description:
cc @sdesrozis