Change to how findVlans() operates. Mostly this is so I can change switchesWithPortsInVlan() to not ask about a specific vlan (which will timeout if the vlan is greater then its max). findVlans() is already asking each device for its total set of vlans, so lets save info instead of throwing it away.
Change to how findVlans() operates. Mostly this is so I can change
switchesWithPortsInVlan() to not ask about a specific vlan (which will
timeout if the vlan is greater then its max). findVlans() is already
asking each device for its total set of vlans, so lets save info
instead of throwing it away.

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