Add option (-w) to wait for a locked lease rather than just failing.
Add option (-w) to wait for a locked lease rather than just failing.

The former Approve method of a lease is now AllocResources and there is
a corresponding DeallocResources.

Check for changes of state that might have occured while waiting for a lease.

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