Fix to snmpit_force10 for recent versions of FTOS (9.9+).
Fix to snmpit_force10 for recent versions of FTOS (9.9+).

FTOS has changed from using vlan-specific ifIndexes to the more
sensible choice of vlan tags as indexes in the Q-BRIDGE-MIB tables.
However, it still uses these ifindexes in the RFC1213 and IF-MIB
mibs!  This broke the snmpit_force10 module.

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