* Update MVAPICH2 package for 2.3.2 release
Update default build from psm to mrail
* Update different provides for older versions based on feedback from Todd Gamblin
* Simplify rule so one rule covers 2.1 and 2.2
* Add support for disabling rpath based on feedback from Dr. Shende
* Add colon based on comment
* Address review comment by Adam Stewart
* Add declaration of the wrapperpath variant.
- Thanks to Massimiliano Culpo for the comment
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