use postgres connection info to connect layer to same pg database as locally

[pvgenuchten]

at foss4ge mostar a participant reported this issue to me, not sure if the case has actually been implemented

considering that both qgis as well as mapserver (or geoserver) can access the same postgis database

when publishing a project, use the database connection details from qgis to let mapserver or geoserver use the same database connection to fetch data from (so don't upload any data)

potentially allow users to override some connection details, in case the same database is accessble from map/geoserver under a different url, or a users wants to use a read only user for the db connection.

[GeoSander]

I can confirm that this does not work (Bridge creates some kind of "default" database connection on the GeoServer side, which fails to connect), so this is a bug that should be fixed.