NA OFI: add support for FI_THREAD_DOMAIN
NA OFI: add support for FI_THREAD_DOMAIN

When NA_THREAD_MODE_SINGLE is passed, FI_THREAD_DOMAIN can be used
to relax default's FI_THREAD_SAFE thread mode.

mercury-hpc/mercury,mercury-hpc/mercury,mercury-hpc/mercury,mercury-hpc/mercury