Implement the custom role concept

- Custom Ansible roles can be stored in the `roles/custom` directory
- The list `custom_roles` determines which roles are included

roles/lmn_fvs/files/pwroff

@@ -1,48 +0,0 @@
-#!/bin/bash
-#
-# logout idle users and shutdown machine
-#
-set -eu
-
-action="systemctl poweroff"
-uptime=$(cat /proc/uptime | cut -f1 -d.)
-maxidle=3600  ## seconds
-
-u=($(loginctl list-users --no-legend  | sort -hr | head -1))
-una=${u[1]:-''}
-uid=${u[0]:-''}
-
-talk2dbus() {
-    local display=":$(ls /tmp/.X11-unix/* | sed 's#/tmp/.X11-unix/X##' | head -n 1)"
-    sudo -u $una DISPLAY=$display \
-	 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus "$@"
-}
-
-########
-
-## shutdown if nobody is loged in:
-if [[ -z "$una" ]] || [[ $uid -lt 1000 ]] ; then
-  exec $action
-fi
-
-# FIXME: find idle time independent of running screensaver
-if ! t=$(talk2dbus qdbus org.kde.screensaver /ScreenSaver GetActiveTime) ; then
-    echo "No graphical logins found."
-else
-    idle=$(( t / 1000 ))
-    if [[ $idle -gt $maxidle ]] && [[ ! -d "/srv/samba/schools/default-school/teachers/" ]] ; then
-        talk2dbus notify-send -i system-shutdown -u critical -a 'Important System Information' \
-	          'Please log out, the system will shut down soon!' \
-	          'There has been no activity for too long.'
-        ## shutdown:
-        #talk2dbus qdbus org.kde.ksmserver /KSMServer logout 1 2 0
-        ## logout:
-        talk2dbus qdbus org.kde.ksmserver /KSMServer logout 1 0 0 || \
-	    loginctl terminate-user $una
-        echo "Log-out user $una after being idle for $idle seconds."
-    else
-        echo "The user $una has been idle for $idle seconds."
-    fi
-fi
-
-#w -s | grep tty | sed "s/[[:space:]]\+/ /g" | cut -f4 -d ' '