OpenMPI environment variable used to disable need for OpenSSH

Until now, OpenMPI would complain about not having `ssh' or `rsh' as a
remote shell feature. However, such features should not be necessary in a
reproducible scenario and they also have major security issues.

With this commit, we are now using OpenMPI's `OMPI_MCA_plm_rsh_agent'
environment variable to disable any remote shell dependency for it (as
suggested by Boud). Therefore, any dependency for OpenSSH has been
removed. But I thought to keep the build instructions incase it may be
useful under some un-foreseen scenario. However, to discourage people from
building it, a notice was added ontop of the build instructions.

This bug was found, tested and solved thanks to Roberto Baena Gallé and
Boud Roukema.

This fixes bug #56724.

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