Added chars '?+' in the regex for the desires field in table virt_node_desires. This is needed to support assign's new 'local' features.
Added chars '?+' in the regex for the desires field in table virt_node_desires.
This is needed to support assign's new 'local' features.

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