caddy-frontend: Really support proxy path with spaces

Caddy's proxy stanza for defined path with spaces sometimes is working when
it's done like this:

  proxy /path with_spaces ip:port

It happens, that few first requests after starting Caddy it's working, but
then it fails with error message like:

  dial tcp: lookup with_spaces on ip: no such host

So to stabilise situation now paths are generated like:

  proxy "/path with_spaces" ip:port

software/caddy-frontend/buildout.hash.cfg

@@ -50,7 +50,7 @@ md5sum = f20d6c3d2d94fb685f8d26dfca1e822b
 
 [template-default-slave-virtualhost]
 _update_hash_filename_ = templates/default-virtualhost.conf.in
-md5sum = 82c3908c9f6346356179646211058bf5
+md5sum = 266f175dbdfc588af7a86b0b1884fe73
 
 [template-backend-haproxy-configuration]
 _update_hash_filename_ = templates/backend-haproxy.cfg.in

software/caddy-frontend/templates/default-virtualhost.conf.in

@@ -107,7 +107,7 @@
   # Zope configuration
 {%-   for (proxy_name, proxy_comment) in proxy_append_list %}
   # {{ proxy_comment }}
-  proxy /{{ proxy_name }} {{ backend_url }} {
+  proxy "/{{ proxy_name }}" {{ backend_url }} {
 {{ proxy_header() }}
 {%-     if proxy_name == 'prefer-gzip' %}
     without /prefer-gzip
@@ -197,7 +197,7 @@
 {%-     endif %}
   }
 {%-     for websocket_path in websocket_path_list %}
-  proxy /{{ websocket_path }} {{ backend_url }} {
+  proxy "/{{ websocket_path }}" {{ backend_url }} {
 {{ proxy_header() }}
     websocket
 {%-       if websocket_transparent %}
@@ -230,7 +230,7 @@
 
 {%-   for (proxy_name, proxy_comment) in proxy_append_list %}
   # {{ proxy_comment }}
-  proxy /{{ proxy_name }} {{ backend_url }} {
+  proxy "/{{ proxy_name }}" {{ backend_url }} {
 {{ proxy_header() }}
 {%-     if proxy_name == 'prefer-gzip' %}
     without /prefer-gzip