Prevents keystone from listening on port 80

Change-Id: Idf1ec73c3f42b27ec1d0887e47b02bac5214cd87
Closes-Bug: #1488121

docker_templates/keystone/Dockerfile.j2

@@ -43,6 +43,7 @@ RUN yum -y install \
 RUN apt-get install -y --no-install-recommends \
         apache2 \
         libapache2-mod-wsgi \
+    && echo > /etc/apache2/ports.conf \
     && apt-get clean
 
     {% endif %}