Fix free/down counts to be consistent; node in PXEWAIT appear down, so ignore that count as free only.
Fix free/down counts to be consistent; node in PXEWAIT appear down, so
ignore that count as free only.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome