Add method to flush and reload the reservation info from the node object.
Add method to flush and reload the reservation info from the node
object.

Method to find out if a physical node has any virtual nodes allocated
to it.

Method to release the bandwidth that a vnode on a shared host is
using. This uses the vinterfaces table to find out what link is using,
and then increments the remaining_bandwidth of the interface_state
table. Tables are locked of course.

Add method to allocate an rtabid, since like ssh ports on remote
nodes, the rtabid is now a shared counter on a sharedhost.

Hmm, a change to the TipServer() method that was for using console on
boss.

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