Checkmk Werk 12625: Fix invalidation of session on logout

ID: 12625 Title: Fix invalidation of session on logout Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If the global setting "Limit login to single session at a time" was used, the session was not correctly invalidated on logout. The user was not able to do a login again until the configured session timeout was met.