Add Ldaptive support for Relay staff attributes

@frett 

Note this PR already includes the changes from https://github.com/GlobalTechnology/idm-user-management/pull/6
Sounds fine. I'll leave it as is for now and you can change at your leisure, if that's alright. I made the change since the key guid not being set resulted in the overall guid not being set on user save, and this broke my tests where object equals was concerned.