Allow to pass backend list.

software/erp5/snippet-backend.cfg

@@ -44,3 +44,4 @@ maxconn = %(maxconn)s
 server-check-path = %(server_check_path)s
 wrapper-path = $${basedirectory:services}/haproxy-%(backend_name)s
 binary-path = ${haproxy:location}/sbin/haproxy
+backend-list = %(haproxy_backend_list)s

software/erp5/software.cfg

@@ -102,7 +102,7 @@ mode = 0644
 [template-snippet-backend]
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/snippet-backend.cfg
-md5sum = 28357b5a1490fc715869b79b6d1bdb8c
+md5sum = 2e3b983a3bd5029411a7d2d08b6796d7
 output = ${buildout:directory}/template-snippet-backend.cfg
 mode = 0644