Fixes #4173: Move r30400 to v1.7 branch (Some minor cleanups:)

Cherry-pick the print and show_help changes - leave proc_info.h alone as we would otherwise have to also update the sensor framework, which isn't required for 1.7.5

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r30400 [[BR]]
Some minor cleanups:

* don't return null if someone wants to print ORTE_SUCCESS

* rename some stale process types

* keep show_help local if we are in standalone operation as there is nobody to send it to

cmr=v1.7.5:reviewer=jsquyres