Fixes apache duplicated Listen statements

The apache module adds a ports.conf file that
contains a Listen 80 statement, at the same time
the horizon puppet module adds a Listen 0.0.0.0:80
statement that conflicts with the default apache
configuration.

Change-Id: Id294d0462d2106035ec6d860af051bb437cc97ef
(cherry picked from commit 2e88aa6bbb0af414c948fabd715398ac671bb5b4)