Add cpu/memory accounting to many roles

roles/borg-client/tasks/main.yml

roles/crond/tasks/main.yml

roles/dovecot/tasks/main.yml

roles/grafana/tasks/main.yml

roles/mariadb/tasks/main.yml

roles/matrix/tasks/main.yml

roles/nginx/tasks/main.yml

roles/opendkim/tasks/main.yml

roles/planet/tasks/main.yml

roles/postfix/tasks/main.yml

roles/postfwd/tasks/main.yml

roles/quassel/tasks/main.yml

roles/security_tracker/tasks/main.yml

roles/sogrep/tasks/main.yml

roles/spampd/tasks/main.yml

roles/sshd/tasks/main.yml

roles/syncrepo/tasks/main.yml

roles/unbound/tasks/main.yml

roles/zabbix-agent/tasks/main.yml

roles/zabbix-server/tasks/main.yml