fix epel: ansible_lsb is not resolved on all distributions

 fatal: [icehouse-neutron-rhel7-testing] =>
 {'msg': "One or more undefined variables: 'ansible_lsb' is undefined", 'failed': True}

fails on rhel and fedora for me ansible_distribution_release|int works

Change-Id: Ibfadbc3ba205ea2f50c62603a62ded43dc83bf97