Use a pipe to avoid a potentially big sql file
Use a pipe to avoid a potentially big sql file

Use a pipe to route output of raster2pgsql to psql client in order to
avoid a potentially big temporary sql file (in some tests, about 12GB).
This should fix #1492

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