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Silence OpenMPI warning about InfiniBand

Steffen Müthing requested to merge feature/silence-openmpi-infiniband-warning into master

OpenMPI detects the InfiniBand kernel device on the nodes in Heidelberg and immediately wants to use - but Docker won't let it, so it dumps a really verbose warning to stderr. As we really don't need InfiniBand support in our tests, just shut up the warning.

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