[importer] Refactor calls to CSV normalizers
[importer] Refactor calls to CSV normalizers

nyimbi/cartodb,raquel-ucl/cartodb,UCL-ShippingGroup/cartodb-1,nyimbi/cartodb,DigitalCoder/cartodb,UCL-ShippingGroup/cartodb-1,splashblot/dronedb,CartoDB/cartodb,nuxcode/cartodb,splashblot/dronedb,raquel-ucl/cartodb,dbirchak/cartodb,codeandtheory/cartodb,thorncp/cartodb,future-analytics/cartodb,splashblot/dronedb,future-analytics/cartodb,codeandtheory/cartodb,bloomberg/cartodb,dbirchak/cartodb,raquel-ucl/cartodb,CartoDB/cartodb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,codeandtheory/cartodb,nyimbi/cartodb,DigitalCoder/cartodb,raquel-ucl/cartodb,UCL-ShippingGroup/cartodb-1,CartoDB/cartodb,nuxcode/cartodb,bloomberg/cartodb,thorncp/cartodb,dbirchak/cartodb,thorncp/cartodb,DigitalCoder/cartodb,CartoDB/cartodb,nyimbi/cartodb,thorncp/cartodb,raquel-ucl/cartodb,dbirchak/cartodb,future-analytics/cartodb,bloomberg/cartodb,splashblot/dronedb,DigitalCoder/cartodb,thorncp/cartodb,future-analytics/cartodb,CartoDB/cartodb,nuxcode/cartodb,nuxcode/cartodb,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,future-analytics/cartodb,dbirchak/cartodb,DigitalCoder/cartodb,splashblot/dronedb,nuxcode/cartodb,nyimbi/cartodb,bloomberg/cartodb,bloomberg/cartodb