Role crush when running ansible with python3

Python3 does not have iteritems method on dict type.

roles/system/templates/hosts.j2:{% for host, address in system_additional_hosts.iteritems() %}
roles/system/vars/main.yml:    {% for group, values in getent_group.iteritems() %}
roles/system/vars/main.yml:    {% for user, values in getent_passwd.iteritems() %}

we should use method items instead