- added nodegroup_id column to slice_attributes table and view_slice_attributes view.
- added nodegroup_id column to slice_attributes table and view_slice_attributes view.


dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi