modify some sshd config details, remove marcel's last keys

move pam mkhomedir from ad-auth, rename variables, set defaults, add
variables, move molly-guard

ad-auth/files/pam/mkhomedir

-Name: Create home directory during login
-Default: yes
-Priority: 900
-Session-Type: Additional
-Session:
-        required        pam_mkhomedir.so umask=0077 skel=/etc/skel

ad-auth/tasks/pam.yml

@@ -8,13 +8,3 @@
   tags:
     - pam 
     - config
-
-- name: ensure pam creates a home dir if necessary
-  copy: src=pam/mkhomedir dest=/usr/share/pam-configs/mkhomedir owner=root group=root mode=0644
-  when: "'clients' not in group_names"
-  notify:
-    - regenerate pam config
-  tags:
-    - pam 
-    - config
-