The os-fping API was deprecated in nova in
I92064cbcb5f6414da0c9d294f912a860428af698. I can't see anything
obviously using it on codesearch.

This is only in EPEL for centos, which I'm trying to remove. But I
think less dependencies is always better than more in general hence
the removal.

This is essentially a revert of
Ibdc7479a9038321e4fc3953774a6f3e1dac90530

Change-Id: I163fc48c860bae2a92c83cfdaed26b2e54630e20