HAProxy template has bind ports hardcoded

Issue

• The oadm router command supports binding to other ports with the --ports flag, but it doesn't work because of the hardcoded values in the haproxy template (bind :443, bind :80)
  Upstream issue: https://github.com/openshift/origin/issues/4907
  The code: https://github.com/openshift/origin/blob/master/images/router/haproxy/conf/haproxy-config.template#L36 & https://github.com/openshift/origin/blob/master/images/router/haproxy/conf/haproxy-config.template#L53