Change user creation

[Pierrotws]

Users for now does'nt honor "system", nor custom login shell, home, etc..

Proposed solution 1

Use an object to specify user, allow to seamlessly add any user option

Proposed solution 2

• add "manage_users" variable
• add "*_manage_user" variable foreach services, that inherit of manage_users per default
• add /var/lib/{username} as home, and nologin hardcoded
• create user when *_manage_user

[Pierrotws]

As discussed in meeting, solution 2 is to be implemented