Addition debug output for rt_raster_from_gdal_dataset()

git-svn-id: http://svn.osgeo.org/postgis/trunk@11116 b70326c6-7e19-0410-871a-916f4a2858ee
Changed name of exclusion constraint to by dynamic due to conflict of
implicit index names. Ticket #2215

git-svn-id: http://svn.osgeo.org/postgis/trunk@11117 b70326c6-7e19-0410-871a-916f4a2858ee