Bugfixes: Print disk images in rspecv2, use 'emulab-openvz' sliver_type
Bugfixes: Print disk images in rspecv2, use 'emulab-openvz' sliver_type

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