Raster: disable setting the max extent constraint
Raster: disable setting the max extent constraint

Disable setting that constraint that seems to consume a lot of resources
when creating tables and is not needed for our use case.

See http://postgis.net/docs/using_raster_dataman.html

This is part of the improvements for #1492

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