fix hostname of cobald slurm node

made cobald be able to run slurm jobs, previously failing with
permission denied.

roles/cobald/tasks/main.yml

@@ -118,9 +118,6 @@
     networks:
     - name: "{{cobald_docker_network}}"
     networks_cli_compatible: True
-#    env:
-#      slurmuser: "{{slurm_user}}"
-#    privileged: "{{ container_privileged | bool }}"
     state: started
     detach: True
     cleanup: True