snmpit_force10 work - more cleanup, fixes, and wacky bitmath!
snmpit_force10 work - more cleanup, fixes, and wacky bitmath!

Please let this be the last commit of any significance for a while
for the force10 module.  I discovered that tricky bitmath was required
to get the port removal right when mixing tagged and untagged ports.

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