SHMEM: silence warning
Refs #3763
Avoid use of PMI components when launched via mpirun as this is just unnecessary overhead that can cause confusion.

cmr=v1.7.4:reviewer=miked:subject=Avoid use of PMI components when launched via mpirun
Continue the quest for valgrind silence - ensure that the db modules are given a chance to cleanup, and that the hash module releases all of its memory

cmr=v1.7.5:reviewer=jsquyres:subject=Silence db framework valgrind reports