- Add patch to fix delays on shutdown (boo#1210391):
* 0001-Avoid-starting-a-new-session-on-exit.patch

- Replace proper_pam.diff with installation of source files:
* sddm.pam, sddm-autologin.pam, sddm-greeter.pam
- PAM services:
* Make use of substack for common-*
* Include postlogin-*
* Run pam_keyinit before common-session
* Deny password in sddm-greeter
- /run/sddm is owned by root:root
- Add patch to fix possible deadlock:
* 0001-Process-all-available-auth-messages-in-a-loop.patch
- Add missing dependencies on update-alternatives

- Migration of PAM settings to /usr/lib/pam.d.

- Honor /etc/nologin like login, sshd, xdm and gdm do
* added: auth requisite pam_nologin.so to proper_pam.diff
* see: man 5 nologin