Description of problem:
If set env ROUTER_SYSLOG_ADDRESS=127.0.0.1 for haproxy router, then find below warning message in haproxy log:
[WARNING] 010/021149 (26) : parsing [/var/lib/haproxy/conf/haproxy.config:31] : 'option httplog' not usable with frontend 'public_ssl' (needs 'mode http'). Falling back to 'option tcplog'.

Looks it's harmless since it shows "Falling back to 'option tcplog'", but better to dismiss it by updating haproxy-config.template. 

Version-Release number of selected component (if applicable):
openshift v3.9.0-0.16.0
kubernetes v1.9.0-beta1

How reproducible:
always

Steps to Reproduce:
1. oc env dc/router ROUTER_SYSLOG_ADDRESS=127.0.0.1
2. oc logs router-x-xxxxx
3.

Actual results:
[WARNING] 010/021149 (26) : parsing [/var/lib/haproxy/conf/haproxy.config:31] : 'option httplog' not usable with frontend 'public_ssl' (needs 'mode http'). Falling back to 'option tcplog'.

Expected results:
should not show the warning message

Additional info:
update the haproxy-config.template as below, no warning message.
<---snip--->
frontend public_ssl
{{- if ne (env "ROUTER_SYSLOG_ADDRESS") ""}}
  option tcplog
{{- end }}
<---snip--->