Allow Connector update the database schema without restart

[Denis Signoretto]

Hi Syncopers,
 
at the moment if an external resource schema changes (e.g. column added or 
renamed),
the DB connector, can't see the changes until a Syncope restart (I'm wrong?). 
 
As a future improvement what do you think about a "db schema update" 
functionality for DB connector?
 
Regards,
Denis.