haproxy: use bind option to specify listen ip:port instead of putting it in 'listen' line.

that is a long-deprecated syntax and removed in haproxy 1.6.

slapos/recipe/haproxy/template/haproxy-listen-snippet.cfg.in

-listen %(name)s %(ip)s:%(port)s
+listen %(name)s
+  bind %(ip)s:%(port)s
   cookie  SERVERID insert
   balance roundrobin
   %(httpchk)s

stack/erp5/buildout.cfg

@@ -358,7 +358,7 @@ md5sum = 713b22938d7212c8506449bc0508452b
 [template-haproxy-cfg]
 <= download-base
 filename = haproxy.cfg.in
-md5sum = 7f13123698afe017dfcde9de6beea0f5
+md5sum = 92c84313fd42f93565c5e5c3d9582bf2
 
 [bt5-repository]
 # Format:

stack/erp5/haproxy.cfg.in

@@ -37,7 +37,8 @@ defaults
   option forceclose
 
 {% for name, (port, backend_list) in parameter_dict['backend-dict'].items() -%}
-listen {{ name }} {{ parameter_dict['ip'] }}:{{ port }}
+listen {{ name }}
+  bind {{ parameter_dict['ip'] }}:{{ port }}
   http-request set-header X-Balancer-Current-Cookie SERVERID
 {%   set has_webdav = [] -%}
 {%   for address, connection_count, webdav in backend_list -%}