[trunk 3353] db_user parameter dont work

in sql_db.py

_dsn = ''
for p in ('host', 'port', 'user', 'password'):
    cfg = tools.config['db_' + p]
    if cfg:
        _dsn += '%s=%s ' % (p, cfg)

def dsn(db_name):
    return '%sdbname=%s' % (_dsn, db_name)

_dns set when module is import, before config file and parameter read, and never reset after, so on my test _dns = user:user of the ubuntu session

to solve the problem i do

def dsn(db_name):
    return 'user=%s dbname=%s' % (tools.config['db_user'], db_name)

take the true user from the config

good luck with this bug, it give me a headache