* A new config option for disabling users with the options "none", "attribute" and "group".
* When set to "none", there will be no enabledAttribute returned in user info and trying to change enabledAttribute will return an error
* Disable/enable group name DN as config parameter
* Adding/removing users to specified group on user update
* Changing log level for service initialization failure to error
* Adding helper methods to check if user is enabled/disabled + tests
Fixes#5554