caddy-frontend: Pass parameters w/o buildout expansion

Instead of needlessly storing information in configuration section, pass it
via jinja2 parameter. This is safe, in case if extra_slave_instance_list
would contain value like ${section:option}.

software/caddy-frontend/buildout.hash.cfg

@@ -14,7 +14,7 @@
 # not need these here).
 [template]
 filename = instance.cfg.in
-md5sum = 2c2d051825c76384732faad9c407c538
+md5sum = 8bdb588d33bf5cd059495a5c3e6dd049
 
 [template-common]
 filename = instance-common.cfg.in
@@ -22,7 +22,7 @@ md5sum = c801b7f9f11f0965677c22e6bbe9281b
 
 [template-apache-frontend]
 filename = instance-apache-frontend.cfg.in
-md5sum = 5cfc4dd69c2800906d6648c626023cf0
+md5sum = 750e2b1c922bf14511a3bc8a42468b1b
 
 [template-apache-replicate]
 filename = instance-apache-replicate.cfg.in

software/caddy-frontend/instance-apache-frontend.cfg.in

@@ -124,7 +124,7 @@ template = {{ parameter_dict['template_slave_list'] }}
 filename = custom-personal-instance-slave-list.cfg
 extensions = jinja2.ext.do
 slave_instance_list = {{ dumps(instance_parameter['slave-instance-list']) }}
-extra_slave_instance_list = ${configuration:extra_slave_instance_list}
+extra_slave_instance_list = {{ dumps(instance_parameter.get('configuration.extra_slave_instance_list')) }}
 local_ipv4 = {{ dumps(instance_parameter['ipv4-random']) }}
 local_ipv6 = {{ dumps(instance_parameter['ipv6-random']) }}
 software_type = single-custom-personal

software/caddy-frontend/instance.cfg.in

@@ -81,7 +81,6 @@ configuration.apache-key =
 configuration.apache-certificate =
 configuration.apache-ca-certificate =
 configuration.open-port = 80 443
-configuration.extra_slave_instance_list =
 configuration.disk-cache-size = 8G
 configuration.ram-cache-size = 1G
 configuration.trafficserver-autoconf-port = 8083