varnish: Provide backend-url to recipe as parameter.

software/varnish/instance-varnish.cfg.in

@@ -23,6 +23,7 @@ url = http://${varnish-instance:ip}:${varnish-instance:server-port}/
 
 [varnish-instance]
 recipe = slapos.cookbook:generic.varnish
+backend-url = {{ slapparameter_dict['backend-url'] }}
 
 # Network options
 ip = ${slap-network-information:local-ipv4}

software/varnish/software.cfg

@@ -87,7 +87,7 @@ extra-context =
 [template-varnish]
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/instance-varnish.cfg.in
-md5sum = d1d174222fccd76729ac9e4c36be0a0a
+md5sum = 699d31010ec9924093dfdc8f4f40d341
 mode = 640
 
 [eggs]