Fixes #4611: Move r31709 to v1.8 branch (Linux specfile: update %description blocks)

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r31709 [[BR]]
Linux specfile: update %description blocks

Update the Open MPI description and fix lots of grammatical errors in
the OpenSHMEM description.

cmr=v1.8.2:reviewer=ompi-rm1.8
Fixes #4606: Move r31685 to v1.8 branch (Flush the show_help system on)

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r31685 [[BR]]
Flush the show_help system on our way out - this also restores the opal_show_help function pointer to the OPAL layer for any subsequent processing.

cmr=v1.8.2:reviewer=jsquyres