Mark the ompi_rte_abort() function as "no return"

This allows compilers to know that the code path(s) where
ompi_rte_abort() is invoked won't return (and therefore won't warn in
certain cases).

cmr=v1.8:reviewer=rhc
Allow the user to turn off the oversubscribed-binding warning if overload-allowed has been provided

Refs #4317