Add config.CapacitySchedulerConfig class.
Add hadmin.config.ConfigManager that keeps track of all the configs.
Remove hadmin/auto.py because it's not used anymore.
Add useradd command, hadmin.config.HadminManager.

hadmin.config.HadminManager manages adding users and queues in a
sensible way.
Add del_user, other things
useradd and userdel both work
Adding/removing users and admins is done.