Fixed bug in list_slices. Slices'urn was not correct because of the use of slicename_to_hrn from plaetlab,plxrn.
Fixed bug in list_slices. Slices'urn was not correct
because of the use of slicename_to_hrn from plaetlab,plxrn.

yippeecw/sfa,yippeecw/sfa,yippeecw/sfa,onelab-eu/sfa,onelab-eu/sfa,onelab-eu/sfa