[ofw] ib-diags: compatability issue with ibstat

[Hefty, Sean]

So far, it seems that the choices are:

1. Remove ibstat and use ibv_devinfo instead
2. Change ibstat to obtain the fdr10 information using ibverbs
3. Move the is_fdr10 functionality into OS specific files or code sections of ibstat
4. Change ibstat to obtain fdr10 data using MADs or some other OS independent mechanism
5. Change ibumad so that it provides the fdr10 data
   Note: umad has OS dependent implementation anyway, but the windows umad would
         depend on the data being available from ibverbs
6. ???

Can someone explain why the information can't come from the umad_port::rate field?

- Sean