Revert "Switch to systemd automount ..." and "krb5.conf from ..."

SMB automount seems to have major problems with multiuser mounts.
For the first logged in user, everything seems to be fine.
For every following logged in user, strange things will happen (e.g. firefox has problems showing the webdev console).

This reverts following commits:
 - 9df6c93636 (Switch to systemd automount for /srv/samba/schools/default-school)
 - f08c06d7a6 (krb5.conf from package krb5-user ist require)

roles/lmn_sssd/tasks/main.yml

@@ -5,8 +5,6 @@
       - sssd-ad
       - sssd-tools
       - adcli
-      - kstart
-      - krb5-user
 
 - name: Provide user identities from AD
   ansible.builtin.template:
@@ -24,23 +22,3 @@
   when: >
     ansible_cmdline.adpw | default('') | length > 0 or
     adpw.user_input | default('') | length > 0
-
-- name: Set CCache file name
-  ansible.builtin.lineinfile:
-    dest: /etc/krb5.conf
-    line: '        default_ccache_name = FILE:/tmp/krb5cc_%{uid}'
-    insertbefore: '\[realms\]'
-    state: present
-
-- name: Create kstart systemd service for obtaining machine ticket
-  ansible.builtin.template:
-    src: kstart.service.j2
-    dest: /etc/systemd/system/kstart.service
-    mode: '0644'
-  when: not nfs4
-
-- name: Enable kstart service
-  ansible.builtin.systemd:
-    name: kstart.service
-    enabled: true
-  when: not nfs4

roles/lmn_sssd/templates/kstart.service.j2

@@ -1,11 +0,0 @@
-[Unit]
-Description=K5Start Kerberos Ticket Renewal
-After=network.target
-
-[Service]
-Type=simple
-ExecStart=/usr/bin/k5start -f /etc/krb5.keytab -K 1 -u {{ ansible_hostname | upper }}$
-
-[Install]
-WantedBy=multi-user.target
-