nginx: move the include proxy_params inside the location context

proxy_set_headers are inherited from the parent contexts IFF there are
no proxy_set_header in the current context.
Given that we are adding extra headers due to SSL, move everything in
there.
Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

roles/nginx/templates/conf.d/misc.conf

-# proxy settings
-include proxy_params; # directly coming from the nginx package, they are sane
-proxy_set_header X-Forwarded-Server $hostname;
-
 # security/privacy settings
 add_header X-Frame-Options "SAMEORIGIN";
 add_header X-Xss-Protection "1; mode=block";

roles/nginx/templates/sites/proxied.conf

@@ -22,8 +22,10 @@ server {
     ssl_certificate_key {{ ssl_home }}/localcerts/{{ item.key }}/privkey.pem;
 
     location / {
-        proxy_set_header Host {{ item.key }};
-        proxy_set_header X-Forwarded-Host {{ item.key }};
+        # proxy settings
+        include proxy_params; # directly coming from the nginx package, they are sane
+        proxy_set_header X-Forwarded-Server $hostname;
+        proxy_set_header X-Forwarded-Host $http_host;
         proxy_set_header X-Forwarded-Port 443;
         proxy_set_header X-Forwarded-Ssl on;
         proxy_pass http://{{ item.value }}/;