Hangs in some IMB-RMA tests when I_MPI_ROOT is set and when using a non-One API-provided libfabric
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Description
The IMB-RMA tests Accumulate, Get_accumulate, Fetch_and_op, and Compare_and_swap all hang for us if we use a libfabric version other than the one provided with OneAPI.
If, however, we unset the env var I_MPI_ROOT, all the tests complete normally.
We discovered this because the script which we source for OneAPI MPI is setting that env var:
`source /opt/intel/oneapi/mpi/latest/env/vars.sh release`
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