add stampede3 mpi example from Phil #292

Job	Run time
ucvm-build-cvmh-taper (3.7)	28m 24s
ucvm-build-cvms-cvmh (3.7)	49m 45s
ucvm-build-albacore-cvlsu-ivlsu-wfcvm (3.7)	28m 48s
	1h 46m 57s

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