Removed show-breaking hack

This patch removes hack for Listen directive. It should not be needed
for newer puppet-horizon module and the hack breaks installation
with puppet-horizon module in stable/icehouse.

OPM PR: https://github.com/redhat-openstack/openstack-puppet-modules/pull/51
Fixes: rhbz#1093949

Change-Id: I18039d5e85f4e2cd5ba2ea01433d3d22cd4293bc
Merge "Removed show-breaking hack"