This moves the UserAccounts panel to a page in the System panel.
This simplifies a lot of the existing code in the UserAccounts panel.
I did minimal changes to the sub dialogs so that those can be touched
in following changes, making it easier to review this one alone.
The main panel widget is now CcUsersPage, and is an AdwNavigationView
widget that has a default "current_user_page" page. Each page is a
CcUserPage (careful with the one-character difference between these
two classes).
Each CcUserPage has an associated ActUser object.
* DBus interface was reviewed and there were several things added
to make it more generic and useful for other realm types.
* Use ObjectManager to track objects in realmd. This facilitates
using realmd with the way it now uses multiple interfaces
on objects.
https://bugzilla.gnome.org/show_bug.cgi?id=682185
* In particular support of different credential methods and better
hints for different owners of those credentials, so we can prompt
more cleanly.
* Less abstraction in the realmd interfaces
https://bugzilla.gnome.org/show_bug.cgi?id=680892
The changes in the realmd dbus interface are futureproofing to
support cancellation.
In addition during this time of interface flux, check the
daemon version number to make sure we can talk to it.
https://bugzilla.gnome.org/show_bug.cgi?id=678105
* Use realmd for domain joining and lookup, runtime dependency
* Validate join domain correctly
* Add UmRealmManager for handling some stuff above the autogenerated
realmd dbus code
* Show a dialog if the user's credentials cannot be used to join
the domain. Prompt for admin creds.
* Register the user's login with the AccountsService
* This depends on the CacheUser() method of AccountsService
https://bugzilla.gnome.org/show_bug.cgi?id=677548
