SqlServer: support single sign on / Windows credential authentication
This is done through a new db-extra-arguments section in instance_dir/sources
which is passed as a string to the extra_args named argument of
lgc.db.get_connection. If this argument is Trusted_Connection, windows
authentication is used instead of login/password.
This change requires at least revision 5475ec3f6412 of logilab.common which
will be included in logilab-common 0.46. debian/control updated to mention this
new dependency.
TACHES
======
-- écrire objet stocke/manipule les données
-- extraire tests de chaîne de caractère
* utiliser sqlite
* écrire fonction prend chemin en argument et renvoie contenu
* extraire tests (chaîne de caractère) de spec
* utiliser yams pour schéma