GTNPORTAL-3075: 'override' parameter of NewPortalConfigListener is not taken in account

Problem analysis
- Due to merginging plugins, once override is true in one among portal config, all portals will be overriden.

Fix description
- Set override parameter for each NewPortalConfig instance by value of override parameter of NewPortalConfigListener which processes that NewPortalConfig
GTNPORTAL-3076 Javascript module configured for specific portal site is not loaded properly