Fix some long-standing fragility in parsing assign's output. Previously, if the parsing code couldn't find the line it was looking for it, it would loop forever. Now, it will detect this and return an error.
Fix some long-standing fragility in parsing assign's output. Previously,
if the parsing code couldn't find the line it was looking for it, it
would loop forever. Now, it will detect this and return an error.

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