Remove the vendor_ids parsing.
    
We don't use this functionality any more; we use the transport_type
and device name to identify usnic devices.  It's slightly easier
because we can transport_type+name from ibv_device_open() and don't
have to do an additional ibv_query_device() to get its attributes.

Reviewed by Dave Goodell.

cmr=v1.7.5:reviewer=ompi-rm1.7