Introduction of a new device class (localhome).

- user-home is on local disk
- additional entry in dolphin: home@server
- display info about localhome on login-screen
- provide unison-config for sync home with home@server
- force user to be logged out immediately after first login, because
  home-dir must exists for bind-mounts on /lmn/media

roles/lmn_sssd/templates/sssd.conf.j2

@@ -17,3 +17,6 @@ ad_gpo_access_control = disabled
 ad_gpo_ignore_unreadable = True
 ad_maximum_machine_account_password_age = 0
 ignore_group_members = True
+{% if groups.localhome is defined and inventory_hostname in groups.localhome %}
+override_homedir = /home/%u
+{% endif %}