Issue 3102 - Introduce log_format "data" for storing POST messages

modules/nginx/templates/nginx.conf.erb

 user <%= scope.lookupvar('nginx::params::user') %> <%= scope.lookupvar('nginx::params::group') %>;
 worker_processes <%= worker_processes %>;
 
 error_log /var/log/nginx/error.log notice;
 pid /var/run/nginx.pid;
 
 events {
   worker_connections <%= worker_connections %>;
   <% if scope.lookupvar('nginx::params::multi_accept') == 'on' %>multi_accept on;<% end %>
 }
 worker_rlimit_nofile <%= scope.lookupvar('nginx::params::worker_rlimit_nofile') %>;
 
 http {
   include /etc/nginx/mime.types;
   default_type application/octet-stream;
 
   log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                   '$status $bytes_sent "$http_referer" '
                   '"$http_user_agent" "$http_x_forwarded_for" $scheme '
                   '"$http_accept_language" "$http_host" "$http_x_client_id"';
 
   log_format data '$remote_addr - $remote_user [$time_local] "$request" '
                   '$status $bytes_sent "$http_referer" '
                   '"$http_user_agent" "$http_x_forwarded_for" $scheme '
-                  '"$http_accept_language" "$http_host" "$http_x_client_id"'
+                  '"$http_accept_language" "$http_host" "$http_x_client_id" '
                   '$http_content_length "$http_content_type" $request_body';
 
   access_log /var/log/nginx/access.log main;
   server_tokens off;
 
   sendfile <%= scope.lookupvar('nginx::params::sendfile')%>;
 
   <% if scope.lookupvar('nginx::params::tcp_nopush') == 'on' %>
   tcp_nopush on;
   <% end %>
@@ skipping 25 matching lines @@
   <% if @geoip_country %>
   geoip_country <%= @geoip_country %>;
   <% end %>
   <% if @geoip_city %>
   geoip_city <%= @geoip_city %>;
   <% end %>
 
   include /etc/nginx/conf.d/*.conf;
   include /etc/nginx/sites-enabled/*;
 }