Add yet another cache, this time on parse_roles_playbook
Add yet another cache, this time on parse_roles_playbook

This make the time go down from 15s to 0.3s, on the same exact
test as previous caching.

OSAS/ansible-role-ansible_bastion,mscherer/ansible-role-ansible_bastion,mscherer/ansible-role-ansible_bastion,OSAS/ansible-role-ansible_bastion