Minor change to nonlocal_user handling; slices are created in subgroups of GeniSlices, so need to return that extra group and group membership for users bound to the slice.
Minor change to nonlocal_user handling; slices are created in
subgroups of GeniSlices, so need to return that extra group
and group membership for users bound to the slice.

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