Fixes for adding ports (-m) to shared lans. When lan is shared, do not reset the switchpath; leave it null so that it is recomputed each time. Also, be sure to call setVlanOnSwitchTrunks() for both the target and the source.
Fixes for adding ports (-m) to shared lans. When lan is shared, do not
reset the switchpath; leave it null so that it is recomputed each
time. Also, be sure to call setVlanOnSwitchTrunks() for both the
target and the source.

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