prrte uses libev data structues, not libevent (#16530)
prrte uses libev data structues, not libevent (#16530)

* use libevent not libev

* Add Ralph Castain as a maintainer
iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack