deprecation warning on selinux role

[gerbier]

Describe the bug
I upgrade today my data-node to 4.0.3 using esgf-ansible, and I notice a deprecation warning in ansible logs

To Reproduce
Steps to reproduce the behavior:

1. Run installer with : ansible-playbook -i "${INVENTORY}" -u root --tags data --limit "${HOST_NAME}" --skip-tags gridftp install.yml
2. see error
   2019-10-01 07:41:29,994 p=65375 u=root | [DEPRECATION WARNING]: evaluating (is_7 and firewalld_enabled is defined and firewalld_enabled is changed) as a bare variable, this behaviour will go away and you might need to add |bool to the
   expression in the future. Also see CONDITIONAL_BARE_VARS configuration toggle.. This feature will be removed in version 2.12. Deprecation warnings can be disabled by setting
   deprecation_warnings=False in ansible.cfg.

ESGF Node :

• Managed OS: centos 7
• ansible : ansible-2.8.4-1.el7.noarch
• esgf-ansible Version:4.0.3
• Node type: data-only
• node name : esg1.umr-cnrm.fr