Install with_items: {list} with extra-vars from cml

gistfile1.txt

- hosts: $hosts
  user: $user
  sudo: True
  tasks:
    - name: install
      action: apt pkg=$item force=yes install_recommends=yes
      with_items: ${my_list}

---------------

glasslab@flash:~/workstation/vagrant-workstation/tests4/graphyte_playbooks/playbooks$ ansible-playbook 1.yml -i ../hosts -u vagrant -k --extra-vars="user=vagrant hosts=live-webserver my_list=tree,curl"
SSH password: 

PLAY [live-webserver] ********************* 

GATHERING FACTS ********************* 
ok: [192.168.1.229]

TASK: [install] ********************* 
changed: [192.168.1.229] => (item=tree,curl)

PLAY RECAP ********************* 
192.168.1.229                  : ok=2    changed=1    unreachable=0    failed=0