[dataimport] Drop reference to the 'source' column (closes #4067694). CW 3.19 drops the multi-source support. This column does not exist in 3.19.

#!/bin/sh -e
if [ "$1" = "purge" ] ; then
        update-rc.d cubicweb remove >/dev/null
fi
 
#DEBHELPER#
 
exit 0