Fixed slothd off-by-one pid issue.  Slothd now writes its pid _after_ forking into the background.
Fixed slothd off-by-one pid issue.  Slothd now writes its pid _after_ forking into the background.

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