* [FENIX-58] add siteCode to user

* [FENIX-58] add static constant for sitecode

* [FENIX-58] remove println

* [FENIX-58] add siteCode to user creation & update

* [FENIX-58] add a script to init user's siteCode with an empty string if the property does not exist

* [FENIX-86] add siteCode to allowed keys

Co-authored-by: Mounir Nayab <mounir.nayab@xelians.fr>