Temporary change while debugging linktest; only notify testbed ops when linktest fails on swapin path. Also, add a file link to the swaplog file, which still contains the linktest output.
Temporary change while debugging linktest; only notify testbed ops
when linktest fails on swapin path. Also, add a file link to the
swaplog file, which still contains the linktest output.

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